OS X: Add opt-in for CoreFoundation event dispatcher

Opt-in by setting
	QT_EVENT_DISPATCHER_CORE_FOUNDATION=1

This will make QCoreApplication and QThread create
a QEventDispatcherCoreFoundation instead of a
QEventDispatcherUNIX.

With this change we can now support calling native API
that requires a running Core Foundation event loop
on the QCoreApplication main thread and secondary
threads. Previously this was only supported on the
QGuiApplication main thread.

Rewrite the #ifdef event dispatcher logic slightly:
both OSX and GLIB now gets an "else" branch for the
UNIX event dispatcher, instead of the current "dangling
else" pattern which only works for one #ifdef case.

Change-Id: If853567fa097fe007502b0804c2307a989719866
Task-number: QTBUG-46625
Task-number: QTBUG-48758
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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