Update TODO.
Add prototype stubs and class definitions for all current frame types.
Add UFramesLayout::InputMode*.
Add the third Layout::PointGet overload.
Add FFramesRect, augment/rename conversion functions, add several critical enums, UFramesLayout::BoundsGet()/PointGet()/SizeGet()
Make an excuse for why I don't need to implement an annoying function.
Significant TODO rejiggering.