With the recent change to the Mac font manager, the font is registered
when it's loaded. All we need is the correct ID, because we don't want
to hard code that.
This should hopefully make it clearer what's intended. The delay can
either run its normal course, be interrupted (by clicking), or be
aborted (by quitting).
The idea here is to expose a much smaller part of the MacGui headers to
the SCUMM engine, but introducing a new class that simply relays calls
to the actual Mac GUI. I hope this will allow me to further untangle
things.