RichText and RichEditableText initialize GlobalSettings the first time they're run

Steps to reproduce:
1. Make a flex app that sets GlobalSettings.resolveFontLookup to use its own resolveFontLookup function and later constructs a RichText or RichEditableText

Actual Results:
RichText or RichEditableText calls initClass the first time it gets constructed, which writes over everything in GlobalSettings
resolveFontLookup function is reset, so my font resolution code broke

Expected Results:
Initializing GlobalSettings really shouldn't depend on when a RichText happens to get constructed. In my case, it was being constructed programmatically. It was made a bit harder to figure out because a RichEditableText was being initialized beforehand, so I was fooled into thinking the init routine was safely run already, but it gets run again on the RichText constructor.

Workaround (if any):
I'm constructing a RichText and RichEditableText before setting resolveFontLookup in GlobalSettings, which does work around the problem.