make TextField.redrawContents() public

I ran into a problem in which a TextField is supposed to animate smoothly onto the screen, but the texture generation within TextField.createRenderedContents() blocks the animation, creating a stutter.

In general, it seems like having the ability to render a TextField in advance of it appearing on the display list is a handy thing to have, and the simplest way to achieve that is to make TextField.redrawContents() public.  If there's a better way to handle that situation than loosening access, please let me know...