ecore: Reduce rendering latency in g_main_loop

ecore: Reduce rendering latency in g_main_loop

After a lot of hair pulling, and other debugging, it appears
that to make animation smooth on an embedded device, the
following things should happen in (quick) sequence:

1. update the loop time
2. call timers (which animates and updates the scene graph)
3. call idle enterers (which renders to the display)
4. call fd buf handlers (which flushes xlib stuff)

Signed-off-by: Mike McCormack <mj.mccormack@samsung.com>
git-svn-id: http://svn.enlightenment.org/svn/e/trunk/ecore@61784 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33