Draft: Tiling animations
Add animations to window tiling operations.
There is still some work to do:
- Geometry changes are sometimes incorrect (especially when tiling with a mouse)
- The quickTileModeChanged signal is sometimes emitted more than once (to investigate why)
- Dragging a browser tab continuously triggers quickTileModeChanged which breaks the animation
- Doesn't work properly with Wayland clients
- Effect.CrossFadePrevious doesn't appear to be working
- Some ugly window ghosting appears in the background when tiling from corner to corner