- Use pascel-case type names, instead of snake-case with `_t` suffix.
- Use `GWL_` prefix (short for GhostWayLand), to distinguish these
types from ghost (`GHOST_*`) and wayland (`wl_*`) types.
- Rename `input` to `seat` (following wayland's own terminology).
- Use `wl_` prefix for wayland native variables which have locally
defined equivalents so `GWL_Output *output` isn't confused with
`struct wl_output *wl_output`. As the locally defined types are used
more often this is less verbose overall.
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