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Make Xwayland startup asynchronous

Carlos Garnacho requested to merge wip/carlosg/async-xwayland-startup into master

The startup of Xwayland so far is artificially made to be synchronous. It's either called from meta_init(), and made so the meta_display_open() call happening afterwards is ensured to have the X11 display server running, or called at a later point in time with Xwayland on demand, when we (presumably!) will have a MetaDisplay around.

This MR changes this so 1) we turn Xwayland startup into an asynchronous operation in API and 2) meta_display_init_x11() stands the high level entrypoint that will set up a X server for you if necessary, moving things out of meta_init().

The X11 backend can proceed directly at getting a MetaX11Display at meta_display_open() time, and will definitely need it, so it takes a shortcut instead.

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