ecore evas - add animator update syncing to only render on animator ticks

ecore evas - add animator update syncing to only render on animator ticks

this adds a ifdefable feature to sync rendering only to animator
slots. this should reduce over-render of more frames than a user can
see when updates are triggered by things like mouse movements (which
may come in many times faster than the framerate). this is an
experiment to see if this helps smoothness and load. it also has
problems in e grabs x while rendering - this is now fixed in e18
alreadey, but it is just a config you can turn off.