Convert all coordinates within the visual tools to Vector2D, which has
been significantly extended. Eliminates a lot of issues with accumulated
rounding errors and simplifies a lot of code.
Modernize the visual tools' interactions with the rest of Aegisub by
connecting to signals directly rather than routing everything through
the video display and converting the main visual tool mode toolbar to
the command system.
Extract all references to OpenGL from the visual tools and move them to
OpenGLWrapper as a first step towards making it possible to implement an
alternative video renderer. In the process, eliminate all uses of OpenGL
immediate mode.
Fix a bunch of minor issues and general instability.
Originally committed to SVN as r5823.
Remove hardcoded assumptions about where in the menu items are and
instead bind menu items directly to commands so that customizing the
menu actually works.
Add support for user menu files that override the default one.
Add better support for multiple menus so that all of the menus can
potentially be created by the dynamic menu system rather than just the
main menu bar.
Add support for commands whose names change based on the current project
state so that undo and redo can work properly.
Simplify the menu json format and make commands responsible for
controlling what type of menu item is created rather than allowing
nonsensical configurations.
The Automation menu is currently not implemented.
Originally committed to SVN as r5554.
Thomas Goyne