overlays: extricate overlays from vwm internals

- Move vmon_proc_t under vwm_overlay_t.

- Privatize vwm_overlay_t.

- Update xwindow.c to dynamically create and destroy overlays.

- Cease supplying vwm_t to vwm_overlays_create(), now just
  pass in the bare vwm_xserver_t.

- Update all vwm_overlay_* functions to operate on vwm_overlays_t and
  vwm_overlay_t.  Only vwm_overlays_create() receives the xserver,
  which it then embeds within the returned vwm_overlay_t.

- Eliminate _xwin_ flavors of overlay functions, largely mechanical
  rename eliminating the _xwin_ from the names during the previous
  pass of switching from vwm_t & vwm_xwindow_t to vwm_overlays_t &
  vwm_overlay_t parameters.

- Change vwm_overlay_compose() to store damage in supplied pointer,
  the caller is expected to make use of the damage information now
  because the overlay code doesn't know about the window its coordinate
  space.

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