Script work

Add Envelope script
Add Clips and Boundaries Scripts.
Add docimages_oddments.py for the weirder cases.
Add make html script.
Add more spectral images
Add Dark versions of spectrograms (paul's comment)
Clean up oddments script.

- This commit also adds an option NOT to bring Audacity to the top when screenshotting.
-- That's because QuickPlay will disappear if you do -because you lose mouse capture.
- Also allow negative window IDs in the drag command.

- Registration names of align commands sorted.  They had &, : and / in them.
- Fixed bug in SetTrackInfo where bFocused was being ignored
- Fixed bug where command manager ignored multi-commands.
- Commit docimages_oddments.py again, to fix line endings.

src/commands/ScreenshotCommand.h

@@ -33,6 +33,7 @@ class CommandContext;
 class ScreenshotCommand : public AudacityCommand
 {
 public:
+   ScreenshotCommand(){ mbBringToTop=true;};
    // CommandDefinitionInterface overrides
    wxString GetSymbol() override {return SCREENSHOT_PLUGIN_SYMBOL;};
    wxString GetDescription() override {return _("Takes screenshots.");};
@@ -46,7 +47,9 @@ private:
    wxString mWhat;
    wxString mBack;
    wxString mPath;
+   bool mbBringToTop;
    bool bHasBackground;
+   bool bHasBringToTop;
    friend class ScreenshotCommand;
    friend class ScreenFrame;