Wayland: window resize

[fnzr]

This is more of a proof of concept implementation, because I need to clarify a couple things first:

1. I moved waiting for wayland events to after try core.initWindow(window_id); call. Otherwise, the resizing logic tries to swap the framebuffer before it's ready, crashing the program.

I don't know if this is a viable solution, but if not, we need another way to check if core.initWindow was already called.

2. I'm not sure how to provide the initial window size, so currently the window size is defined solely by the compositor (i think that's standard on wayland?) I don't see examples of it in the examples directory, so I'm not sure if this is a library limitation, wayland limitation, or me limitation.

Working example, there's no changes required on userland:

output.mp4

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[fnzr]

Moved the c.xdg_toplevel_set_title(wl.toplevel, @ptrCast(core_window.title)); call to before the first commit of surface. This allows the window to have a title in creation, allowing compositor to match window rules immediately. This fixes the initial window size problem I was having.

Also added the app_id field on the window, allowing the user to provide a XDG application id to the window. I only made it work on Wayland. I can create a different PR with this feature only if more appropriate.