This involves many subsystems:
- config:
- allow setting the connector scale
- allow setting the cursor size
- cursors:
- load server cursors for all requested sizes and scales
- wl_surface:
- track the output the surface belongs to
- send wl_surface.enter/leave
- wl_output:
- implement wl_output.scale
- text:
- pre-render texts for all used scales
- renderer:
- properly align scale textures and rectangles
- wp_fractional_scale:
- new interface for fractional scaling
