core: backend support matrix

[emidoots]

The goal of this issue is to keep track of what mach.Core features work on which platforms, with the aim of eventual consistency among all our custom windowing backends.

Feature	Windows	Darwin	Linux/wayland	Linux/x11
Single window	✅	✅	✅	✅

Object fields	Windows	Darwin	Linux/wayland	Linux/x11
.title
.framebuffer_width/height (read-only)
.vsync_mode
.display_mode
.cursor_mode
.cursor_shape
.width/height
.refresh_rate
.decorated
.decoration_color
.transparent (not yet existing)
.always_on_top (not yet existing)

Events	Windows	Darwin	Linux/wayland	Linux/x11
event.key_press
event.key_repeat
event.key_release
event.char_input
event.mouse_motion
event.mouse_press
event.mouse_release
event.mouse_scroll
event.window_resize
event.window_open
event.zoom_gesture
event.focus_gained
event.focus_lost
event.close

Not yet being tracked:

• Multiple window support
• Controller input
• Touch / multi-touch input
• Support for alternative platforms: VR, Browser, iOS, Android