gl/wayland: use a proxy wrapper for the wl_display

gl/wayland: use a proxy wrapper for the wl_display

This allows us to remove races when setting the wl_queue on wayland
objects with wl_proxy_set_queue() as each created object is created with
the queue already set.

We can also move all our initilization code into the window as we
can retrieve all wayland objects from each window instance.  This
removes a possible race when integrating with external API's as we would
always attempt to immediately retrieve a small set of wayland objects.
That is no longer the case with the objects from each window instance.