Initial definitions

[waywardmonkeys]

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[waywardmonkeys]

This is an early draft and I'll be force-pushing it and whatever else for a while.

There's plenty to do, including adapters for winit and maybe either web or objc2.

I'd like for this to use dpi, but that isn't yet no_std and hopefully that won't need a breaking revision as this is intended to work with winit 0.30. Daniel has kindly helped out with this in rust-windowing/winit#4175 but remains to see what happens there.

I've used a hyphen in the name as I'm hoping this joins rust-windowing but let's see how that goes as well.

[waywardmonkeys]

I've opened rust-windowing/keyboard-types#69 to offer one way to add no_std support to keyboard-types.