- Add 1-5 shortcuts to zoom between 100% and 1600% quickly
(similar to GIMP).
- When holding down Alt, go through integer zoom values if above 100%
or fractional zoom values with integer denominators if below 100%
(50%, ~33.3%, 25%, …).
- Move most properties from TileMap to TileSet,
- Make TileSet more flexible, supporting more feature (several
collision layers, etc...),
- Fusion both the TileMap and TileSet editor,
- Implement TileSetSources, and thus a new way to index tiles in the TileSet,
- Rework the TileSet and TileMap editors completely,
- Implement an editor zoom widget (and use it in several places)
