ecore_cocoa: fix live resize of windows

ecore_cocoa: fix live resize of windows

This was a tricky little bastard!
When a window is live resized, the NSWindow which is the target of
the live resize will wait for a kevent from the window manager,
until live resizing is done. So... live resizing is synchronous
and blocks the main thread... hence ecore_main_loop.

- When live resize starts, the Ecore_Timer which polls NSRunLoop
is paused.
- When the window is resized, the ecore_main_loop is run manually
with ecore_main_loop_iterate() to process Ecore events (mostly
Ecore_Evas)
- When live resize finished, the Ecore_Timer which polls NSRunLoop
is resumed.

@fix

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>