Wayland move/resize shuffling and placement fixes

This does a few things, roughly in order:

• Put more "window config state" in MetaWindowConfig to separate configuration from other state
• Decouple "placing" from "showing" meaning windows can get sensible positions once floating if mapped fixed
• Track last sent Wayland configuration, instead of duplicating it partially
• Reshuffle meta_window_wayland_move_resize_internal() to make use of the last
• Removes the "fixup queue resize" work around (#1627 (closed))