Add rich text

[whxlxl]

I hope to add rich text controls and add some customized expressions in the game chat interface

[kotcrab]

Sorry, that's out of scope of this project. Any complex text formatting features would have to be implemented in libgdx first.

[czyzby]

@whxlxl Just so you know, there's a library that adds some interesting text effects including animations and custom colors. I assume you can use that without the real time typing effect.