First work on creating a custom-drawn region editor
More incremental progress...
Cleanup, refactoring...
Still cleaning it up...
More refactoring...
Get the track widgets into the scene...
More fixing...
The new region editor can now draw items...
Refactor some currently undefined variables so that they don't become
defined and cause chaos when I start integrating the prototype...
Some final prep work to start integrating the new region editor.
Initial whack at integrating the new region editor...
Begin hooking in some of the actions from the old region editor.
Sort out some of the context menu issues...
Fix the 'edit as group...' actions.
Fix item renaming
Fix auto-unlinking
Remove the old region_list_editor, all of the relevant code has been gutted
out and moved to the new class...
Get SHIFT+click deleting working for the new region editor.
Resizing won't be a feature of 1.0, so gut the leftover code out from
forking the piano roll editor.
Clean up some of the cruft from forking the piano roll editor...