Added formatParse to FlxText: t.text="show $green text$ between dollar s...

...igns"; t.formatParse([greenFormat],["$"]);

(Trying this again)
I can put in some checks and errors, but just thought:

What if the formats.length and markers.length are 0, or both are null? Should it:

  - Throw an error (what's the point of running this if it would do nothing?)
  - Do nothing (not even call clearFormats()) ?
  - Call clearFormats(), then return immediately?