Change QCocoaEventDispatcher timer handling to use QTimerInfoList

Change QCocoaEventDispatcher timer handling to use QTimerInfoList

This gives us support for the various Qt::TimerTypes.

We only use one CFRunLoopTimer to drive all of the Qt timers. We update
the time-to-fire for this timer as we add/remove/fire Qt timers. The
documentation for the CFRunLoopTimerSetNextFireDate() function says that
this is a valid use case, and is more performant than constantly adding
and removing CFRunLoopTimers. The documentation recommends using a large
interval for this use case (the docs say "several decades", but we use 1
year).

Change-Id: Ie7fd7a845f4254699a5b6a5720e7626f2c5e787f
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@nokia.com>