Automation: AudacityCommand

This is a squash of 50 commits.

This merges the capabilities of BatchCommands and Effects using a new
AudacityCommand class.  AudacityCommand provides one function to specify the
parameters, and then we leverage that one function in automation, whether by chains,
mod-script-pipe or (future) Nyquist.

- Now have AudacityCommand which is using the same mechanism as Effect
- Has configurable parameters
- Has data-entry GUI (built using shuttle GUI)
- Registers with PluginManager.
- Menu commands now provided in chains, and to python batch.
   - Tested with Zoom Toggle.

- ShuttleParams now can set, get, set defaults, validate and specify
the parameters.
- Bugfix: Don't overwrite values with defaults first time out.
- Add DefineParams function for all built-in effects.
- Extend CommandContext to carry output channels for results.

We abuse EffectsManager.  It handles both Effects and
AudacityCommands now.  In time an Effect should become a special case of
AudacityCommand and we'll split and rename the EffectManager class.

- Don't use 'default' as a parameter name.
- Massive renaming for CommandDefinitionInterface
- EffectIdentInterface becomes EffectDefinitionInterface
- EffectAutomationParameters becomes CommandAutomationParameters
- PluginType is now a bit field.

This way we can search for related types at the same time.

- Most old batch commands made into AudacityCommands.
The ones that weren't are for a reason.  They are used by mod-script-pipe
to carry commands and responses across from a non-GUI thread to the GUI
thread.

- Major tidy up of ScreenshotCommand
- Reworking of SelectCommand
- GetPreferenceCommand and SetPreferenceCommand
- GetTrackInfo and SetTrackInfo
- GetInfoCommand
- Help, Open, Save, Import and Export commands.
- Removed obsolete commands ExecMenu, GetProjectInfo and SetProjectInfo
  which are now better handled by other commands.

- JSONify "GetInfo: Commands" output, i.e. commas in the right places.

- General work on better Doxygen.
    - Lyrics -> LyricsPanel
    - Meter -> MeterPanel
- Updated Linux makefile.
- Scripting commands added into Extra menu.
- Distinct names for previously duplicated find-clipping parameters.
- Fixed longstanding error with erroneous status field number which
  previously caused an ASSERT in debug.
- Sensible formatting of numbers in Chains, 0.1 not 0.1000000000137

win/Projects/Audacity/Audacity.vcxproj

@@ -137,6 +137,10 @@
     <ClCompile Include="..\..\..\src\Benchmark.cpp" />
     <ClCompile Include="..\..\..\src\BlockFile.cpp" />
     <ClCompile Include="..\..\..\src\blockfile\NotYetAvailableException.cpp" />
+    <ClCompile Include="..\..\..\src\commands\AudacityCommand.cpp" />
+    <ClCompile Include="..\..\..\src\commands\CommandContext.cpp" />
+    <ClCompile Include="..\..\..\src\commands\Demo.cpp" />
+    <ClCompile Include="..\..\..\src\commands\LoadCommands.cpp" />
     <ClCompile Include="..\..\..\src\commands\OpenSaveCommands.cpp" />
     <ClCompile Include="..\..\..\src\Dependencies.cpp" />
     <ClCompile Include="..\..\..\src\DeviceChange.cpp" />
@@ -400,9 +404,7 @@
     <ClCompile Include="..\..\..\src\commands\CommandSignature.cpp" />
     <ClCompile Include="..\..\..\src\commands\CommandType.cpp" />
     <ClCompile Include="..\..\..\src\commands\CompareAudioCommand.cpp" />
-    <ClCompile Include="..\..\..\src\commands\ExecMenuCommand.cpp" />
-    <ClCompile Include="..\..\..\src\commands\AutomationCommands.cpp" />
-    <ClCompile Include="..\..\..\src\commands\GetProjectInfoCommand.cpp" />
+    <ClCompile Include="..\..\..\src\commands\GetInfoCommand.cpp" />
     <ClCompile Include="..\..\..\src\commands\GetTrackInfoCommand.cpp" />
     <ClCompile Include="..\..\..\src\commands\HelpCommand.cpp" />
     <ClCompile Include="..\..\..\src\commands\ImportExportCommands.cpp" />
@@ -413,7 +415,6 @@
     <ClCompile Include="..\..\..\src\commands\ScreenshotCommand.cpp" />
     <ClCompile Include="..\..\..\src\commands\ScriptCommandRelay.cpp" />
     <ClCompile Include="..\..\..\src\commands\SelectCommand.cpp" />
-    <ClCompile Include="..\..\..\src\commands\SetProjectInfoCommand.cpp" />
     <ClCompile Include="..\..\..\src\commands\SetTrackInfoCommand.cpp" />
     <ClCompile Include="..\..\..\src\blockfile\LegacyAliasBlockFile.cpp" />
     <ClCompile Include="..\..\..\src\blockfile\LegacyBlockFile.cpp" />
@@ -473,8 +474,12 @@
     <ClInclude Include="..\..\..\src\Benchmark.h" />
     <ClInclude Include="..\..\..\src\BlockFile.h" />
     <ClInclude Include="..\..\..\src\blockfile\NotYetAvailableException.h" />
+    <ClInclude Include="..\..\..\src\commands\AudacityCommand.h" />
+    <ClInclude Include="..\..\..\src\commands\CommandContext.h" />
     <ClInclude Include="..\..\..\src\commands\CommandFlag.h" />
     <ClInclude Include="..\..\..\src\commands\CommandFunctors.h" />
+    <ClInclude Include="..\..\..\src\commands\Demo.h" />
+    <ClInclude Include="..\..\..\src\commands\LoadCommands.h" />
     <ClInclude Include="..\..\..\src\commands\OpenSaveCommands.h" />
     <ClInclude Include="..\..\..\src\DeviceChange.h" />
     <ClInclude Include="..\..\..\src\Diags.h" />
@@ -501,6 +506,7 @@
     <ClInclude Include="..\..\..\src\prefs\WaveformSettings.h" />
     <ClInclude Include="..\..\..\src\RealFFTf48x.h" />
     <ClInclude Include="..\..\..\src\RefreshCode.h" />
+    <ClInclude Include="..\..\..\src\Registrar.h" />
     <ClInclude Include="..\..\..\src\RevisionIdent.h" />
     <ClInclude Include="..\..\..\src\SelectedRegion.h" />
     <ClInclude Include="..\..\..\src\SelectionState.h" />
@@ -750,9 +756,7 @@
     <ClInclude Include="..\..\..\src\commands\CommandTargets.h" />
     <ClInclude Include="..\..\..\src\commands\CommandType.h" />
     <ClInclude Include="..\..\..\src\commands\CompareAudioCommand.h" />
-    <ClInclude Include="..\..\..\src\commands\ExecMenuCommand.h" />
-    <ClInclude Include="..\..\..\src\commands\AutomationCommands.h" />
-    <ClInclude Include="..\..\..\src\commands\GetProjectInfoCommand.h" />
+    <ClInclude Include="..\..\..\src\commands\GetInfoCommand.h" />
     <ClInclude Include="..\..\..\src\commands\GetTrackInfoCommand.h" />
     <ClInclude Include="..\..\..\src\commands\HelpCommand.h" />
     <ClInclude Include="..\..\..\src\commands\ImportExportCommands.h" />
@@ -763,7 +767,6 @@
     <ClInclude Include="..\..\..\src\commands\ScreenshotCommand.h" />
     <ClInclude Include="..\..\..\src\commands\ScriptCommandRelay.h" />
     <ClInclude Include="..\..\..\src\commands\SelectCommand.h" />
-    <ClInclude Include="..\..\..\src\commands\SetProjectInfoCommand.h" />
     <ClInclude Include="..\..\..\src\commands\SetTrackInfoCommand.h" />
     <ClInclude Include="..\..\..\src\commands\Validators.h" />
     <ClInclude Include="..\..\..\src\blockfile\LegacyAliasBlockFile.h" />