WIP widget system.
WidgetID is now a string.
Move widget loading into Sdl2Window.
Add `ImageWidget`.
Unused plumbing for mouse input.
Clickable widgets!
TODO: Support a clickthrough option.
Add `TextWidget`.
Add `ImageWidget`.
Fix UI Exception params.
Add int2 struct type.
WidgetID is now a string.
Move widget loading into Sdl2Window.
Unused plumbing for mouse input.
Clickable widgets!
TODO: Support a clickthrough option.
Fix duplicate file linkage..?