Clean up embedding api
we now use gdk_offscreen_window_set_embedder() instead of a signal to get the parent. This also replaces set_has_offscreen_changes. Rename "parent" in all embedding related names to "embedder" to make it more obviously different than the normal parent. Rename gdk_window_get_offscreen_pixmap to gdk_offscreen_window_get_pixmap to match the other offscreen calls. Rename gdk_window_offscreen_children_changed to gdk_window_geometry_changed as this is more descriptive.
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