Update LV2 host

This greatly improves the LV2 host to the point where all
(non-midi) plugins distributed with Ubuntu 18.04 and Fedora
30 are supported.

win/Projects/Audacity/Audacity.vcxproj

@@ -55,7 +55,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <Optimization>MaxSpeed</Optimization>
-      <AdditionalIncludeDirectories>$(WXWIN)\lib\vc_dll\mswu;$(WXWIN)\include;..\..;..\..\..\include;..\..\..\src;..\..\..\lib-src\expat\lib;..\..\..\lib-src\FileDialog;..\..\..\lib-src\FileDialog\win;..\..\..\lib-src\ffmpeg\win32;..\..\..\lib-src\ffmpeg;..\..\..\lib-src\lib-widget-extra;..\..\..\lib-src\libflac\include;..\..\..\lib-src\libid3tag;..\..\..\lib-src\libmad\msvc++;..\..\..\lib-src\libmad;..\..\..\lib-src\libnyquist;..\..\..\lib-src\libogg\include;..\..\..\lib-src\libscorealign;..\libsndfile;..\..\..\lib-src\libsoxr\src;..\..\..\lib-src\libvamp;..\..\..\lib-src\libvorbis\include;..\..\..\lib-src\portaudio-v19\include;..\..\..\lib-src\portmixer\include;..\..\..\lib-src\portsmf;..\..\..\lib-src\sbsms\include;..\..\..\lib-src\soundtouch\include;..\..\..\lib-src\twolame\libtwolame;..\..\..\lib-src\portmidi\pm_common;..\..\..\lib-src\portmidi\pm_win;..\..\..\lib-src\portmidi\porttime;..\..\..\lib-src\lv2\lilv;..\..\..\lib-src\lv2\lv2;..\..\..\lib-src\lv2\suil;..\..\..\lib-src\lame;$(GSTREAMER_SDK)\include\gstreamer-1.0;$(GSTREAMER_SDK)\include\glib-2.0;$(GSTREAMER_SDK)\lib\glib-2.0\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(WXWIN)\lib\vc_dll\mswu;$(WXWIN)\include;..\..;..\..\..\include;..\..\..\src;..\..\..\lib-src\expat\lib;..\..\..\lib-src\FileDialog;..\..\..\lib-src\FileDialog\win;..\..\..\lib-src\ffmpeg\win32;..\..\..\lib-src\ffmpeg;..\..\..\lib-src\lib-widget-extra;..\..\..\lib-src\libflac\include;..\..\..\lib-src\libid3tag;..\..\..\lib-src\libmad\msvc++;..\..\..\lib-src\libmad;..\..\..\lib-src\libnyquist;..\..\..\lib-src\libogg\include;..\..\..\lib-src\libscorealign;..\libsndfile;..\..\..\lib-src\libsoxr\src;..\..\..\lib-src\libvamp;..\..\..\lib-src\libvorbis\include;..\..\..\lib-src\portaudio-v19\include;..\..\..\lib-src\portmixer\include;..\..\..\lib-src\portsmf;..\..\..\lib-src\sbsms\include;..\..\..\lib-src\soundtouch\include;..\..\..\lib-src\twolame\libtwolame;..\..\..\lib-src\portmidi\pm_common;..\..\..\lib-src\portmidi\pm_win;..\..\..\lib-src\portmidi\porttime;$(OutDir)\include;..\..\..\lib-src\lv2\lilv;..\..\..\lib-src\lv2\lv2;..\..\..\lib-src\lv2\suil;..\..\..\lib-src\lame;$(GSTREAMER_SDK)\include\gstreamer-1.0;$(GSTREAMER_SDK)\include\glib-2.0;$(GSTREAMER_SDK)\lib\glib-2.0\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>BUILDING_AUDACITY;FLAC__NO_DLL;XML_STATIC;__STDC_CONSTANT_MACROS;WXINTL_NO_GETTEXT_MACRO;WXUSINGDLL;__WXMSW__;wxDEBUG_LEVEL=0;NDEBUG;WIN32;STRICT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
@@ -86,7 +86,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <Optimization>Disabled</Optimization>
-      <AdditionalIncludeDirectories>$(WXWIN)\lib\vc_dll\mswud;$(WXWIN)\include;..\..;..\..\..\include;..\..\..\src;..\..\..\lib-src\expat\lib;..\..\..\lib-src\FileDialog;..\..\..\lib-src\FileDialog\win;..\..\..\lib-src\ffmpeg\win32;..\..\..\lib-src\ffmpeg;..\..\..\lib-src\lib-widget-extra;..\..\..\lib-src\libflac\include;..\..\..\lib-src\libid3tag;..\..\..\lib-src\libmad\msvc++;..\..\..\lib-src\libmad;..\..\..\lib-src\libnyquist;..\..\..\lib-src\libogg\include;..\..\..\lib-src\libscorealign;..\libsndfile;..\..\..\lib-src\libsoxr\src;..\..\..\lib-src\libvamp;..\..\..\lib-src\libvorbis\include;..\..\..\lib-src\portaudio-v19\include;..\..\..\lib-src\portmixer\include;..\..\..\lib-src\portsmf;..\..\..\lib-src\sbsms\include;..\..\..\lib-src\soundtouch\include;..\..\..\lib-src\twolame\libtwolame;..\..\..\lib-src\portmidi\pm_common;..\..\..\lib-src\portmidi\pm_win;..\..\..\lib-src\portmidi\porttime;..\..\..\lib-src\lv2\lilv;..\..\..\lib-src\lv2\lv2;..\..\..\lib-src\lv2\suil;..\..\..\lib-src\lame;$(GSTREAMER_SDK)\include\gstreamer-1.0;$(GSTREAMER_SDK)\include\glib-2.0;$(GSTREAMER_SDK)\lib\glib-2.0\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(WXWIN)\lib\vc_dll\mswud;$(WXWIN)\include;..\..;..\..\..\include;..\..\..\src;..\..\..\lib-src\expat\lib;..\..\..\lib-src\FileDialog;..\..\..\lib-src\FileDialog\win;..\..\..\lib-src\ffmpeg\win32;..\..\..\lib-src\ffmpeg;..\..\..\lib-src\lib-widget-extra;..\..\..\lib-src\libflac\include;..\..\..\lib-src\libid3tag;..\..\..\lib-src\libmad\msvc++;..\..\..\lib-src\libmad;..\..\..\lib-src\libnyquist;..\..\..\lib-src\libogg\include;..\..\..\lib-src\libscorealign;..\libsndfile;..\..\..\lib-src\libsoxr\src;..\..\..\lib-src\libvamp;..\..\..\lib-src\libvorbis\include;..\..\..\lib-src\portaudio-v19\include;..\..\..\lib-src\portmixer\include;..\..\..\lib-src\portsmf;..\..\..\lib-src\sbsms\include;..\..\..\lib-src\soundtouch\include;..\..\..\lib-src\twolame\libtwolame;..\..\..\lib-src\portmidi\pm_common;..\..\..\lib-src\portmidi\pm_win;..\..\..\lib-src\portmidi\porttime;$(OutDir)\include;..\..\..\lib-src\lv2\lilv;..\..\..\lib-src\lv2\lv2;..\..\..\lib-src\lv2\suil;..\..\..\lib-src\lame;$(GSTREAMER_SDK)\include\gstreamer-1.0;$(GSTREAMER_SDK)\include\glib-2.0;$(GSTREAMER_SDK)\lib\glib-2.0\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>BUILDING_AUDACITY;FLAC__NO_DLL;XML_STATIC;__STDC_CONSTANT_MACROS;WXINTL_NO_GETTEXT_MACRO;WXUSINGDLL;__WXMSW__;__WXDEBUG__;_DEBUG;WIN32;STRICT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
@@ -162,6 +162,7 @@
     <ClCompile Include="..\..\..\src\effects\Distortion.cpp" />
     <ClCompile Include="..\..\..\src\effects\EffectRack.cpp" />
     <ClCompile Include="..\..\..\src\effects\Equalization48x.cpp" />
+    <ClCompile Include="..\..\..\src\effects\lv2\zix\ring.cpp" />
     <ClCompile Include="..\..\..\src\effects\NoiseReduction.cpp" />
     <ClCompile Include="..\..\..\src\effects\Phaser.cpp" />
     <ClCompile Include="..\..\..\src\effects\VST\VSTControlMSW.cpp" />
@@ -561,6 +562,8 @@
     <ClInclude Include="..\..\..\src\effects\Distortion.h" />
     <ClInclude Include="..\..\..\src\effects\EffectRack.h" />
     <ClInclude Include="..\..\..\src\effects\Equalization48x.h" />
+    <ClInclude Include="..\..\..\src\effects\lv2\zix\common.h" />
+    <ClInclude Include="..\..\..\src\effects\lv2\zix\ring.h" />
     <ClInclude Include="..\..\..\src\effects\NoiseReduction.h" />
     <ClInclude Include="..\..\..\src\effects\Phaser.h" />
     <ClInclude Include="..\..\..\src\effects\VST\VSTControlMSW.h" />

win/Projects/Audacity/Audacity.vcxproj.filters

@@ -108,6 +108,9 @@
     <Filter Include="src\menus">
       <UniqueIdentifier>{86457c18-e1ec-4e2a-9790-f4ceaf6380a3}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\effects\lv2\zix">
+      <UniqueIdentifier>{fa7108aa-5bf5-4e48-b33a-6af62340e5a1}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\..\..\src\AboutDialog.cpp">
@@ -1253,6 +1256,9 @@
     <ClCompile Include="..\..\..\src\tracks\ui\TrackView.cpp">
       <Filter>src\tracks\ui</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\src\effects\lv2\zix\ring.cpp">
+      <Filter>src\effects\lv2\zix</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\src\AboutDialog.h">
@@ -2443,6 +2449,12 @@
     <ClInclude Include="..\..\..\src\TrackPanelDrawable.h">
       <Filter>src</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\src\effects\lv2\zix\common.h">
+      <Filter>src\effects\lv2\zix</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\..\src\effects\lv2\zix\ring.h">
+      <Filter>src\effects\lv2\zix</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Image Include="..\..\audacity.ico">