ilmControl: rework init + destroy, wl_event_queue

ilmControl: rework init + destroy, wl_event_queue

* Using a private event queue for all ilm_* internal
  wayland communication. This separates the ivi_*
  objects from whatever is used externally.
* Init not happens _only_ on ilm_init
  This also means no more is initialized polling and
  possibly exit(0)ing from get_instace()
* Fixed destroy to happen in main thread where it will
  actually be executed.
* Needed to adapt ilm_commitChanges() to new internal
  wl_event_queue.

Signed-off-by: Marcus Fritzsch <marcus.fritzsch@xse.de>