Move command functors to a new header file, and generalize with templates...

... so that member functions of other than AudacityProject may be called.

Will use this new generality soon for scrubbing menu items.

win/Projects/Audacity/Audacity.vcxproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
@@ -414,6 +414,7 @@
     <ClInclude Include="..\..\..\src\BatchProcessDialog.h" />
     <ClInclude Include="..\..\..\src\Benchmark.h" />
     <ClInclude Include="..\..\..\src\BlockFile.h" />
+    <ClInclude Include="..\..\..\src\commands\CommandFunctors.h" />
     <ClInclude Include="..\..\..\src\commands\OpenSaveCommands.h" />
     <ClInclude Include="..\..\..\src\DeviceChange.h" />
     <ClInclude Include="..\..\..\src\Diags.h" />
@@ -1107,4 +1108,4 @@
   <ImportGroup Label="ExtensionTargets">
     <Import Project="..\..\ny.targets" />
   </ImportGroup>
-</Project>
+</Project>

win/Projects/Audacity/Audacity.vcxproj.filters

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <Filter Include="src">
@@ -1768,6 +1768,9 @@
     <ClInclude Include="..\..\..\src\TrackPanelCellIterator.h">
       <Filter>src</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\src\commands\CommandFunctors.h">
+      <Filter>src\commands</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Image Include="..\..\audacity.ico">
@@ -1988,4 +1991,4 @@
       <Filter>plug-ins</Filter>
     </copy>
   </ItemGroup>
-</Project>
+</Project>