...to increase xwayland and xdg-shell encapsulation and to avoid passing a
function pointer as an argument in `xwayland_move_sub_views_to_front()`
which is inconsistent with labwc design patterns.
Rename view-impl.c to view-impl-common.c
Move function declarations that are common to view-implementations from
view.h into view-impl-common.h
- Move xwayland-specific struct definitions to new xwayland.h header
- Move xwayland_move_sub_views_to_front() from desktop.c to xwayland.c
- Split out xwayland_server_init/finish() from server_init/finish()
- Rename new_xwayland_surface -> xwayland_new_surface and
xwayland_surface_new() -> handle_new_surface() for consistency
- Add "mapped" argument to xwayland_unmanaged_create() so that we can
make unmanaged_handle_map() private to xwayland-unmanaged.c