Update for wlroots 0.18

Things have fallen a bit out of date. I hope it isn't a big problem that I've grouped a lot of stuff into this PR. To try to make it a bit cleaner it is at least broken up into commits. The broad strokes of this are: - Fix two minor typos (`handleOuptuDestroy` -> `handleOutputDestroy`, `PrefferedMode` -> `PreferredMode`) - Delete obsolete wlroots APIs (mainly: the pending state APIs in `wlr_output_*` and the non-renderpass APIs in `wlr_renderer_*` - Update bindings for wlroots 0.18: - Add `RenderPass` API - Add `Display` argument to `NewOutputLayout` and `CreateGlobal` - Add relative direction to `NotifyPointerAxis` - Remove `Vendor`/`Product` from `InputDevice`, since it's not supported anymore - Add `RelativeDirection` enum - Switch values of `AxisSource` to use `wl_pointer_axis` enum - Add `BeginRenderPass` to replace `AttachRender` - Switch `RenderSoftwareCursors` to use `wlr_output_add_software_cursors_to_render_pass` - Switch pkg-config package name for wlroots to wlroots-0.18 - Update tinywl to handle the initial commit for XDG surfaces, since wlroots no longer does this automatically - Updated tinywl to use toplevel/popup callbacks since it's now necessary - Update Go dependencies - Update Nix flake - Use `buildGoModule` - Avoid using `with` and `rec` as they are no longer best practice - Remove usage of `gomod2nix` as it is no longer needed - Update all dependencies - Apply formatting with `nixfmt` There are a few minor things. The GeoBox API wrapper contained a pointer field that was only read and never written to, so it was removed, since the two usages of it were broken. Also, there are a lot of things that could be cleaned up or improved in the future. However, I was able to get this working and run applications in it, so hopefully pending any serious issues we can get this moving :)