Make FlxBitmapText the defacto flixel textField

This is mainly a way to organize my thoughts, I added this to 6.0.0 issues, but that's not likely to happen.

FlxText Sucks

it looks like crap and it's performance is garbage. It's mainly used because FlxText is what people look for and it allows you to use fonts and it displays any character. This brings me to the cold hard truth: FlxBitmapText sucks even harder. While it renders pixel text with pixel-perfect crispness, you need to pre-render a bitmap of every character you'll need. With input text, this may need to include all international characters

Can we generate these bitmap fonts for you?

Drawing text to bitmaps works pretty well outside of html5. In non-web targets we could render the font atlas in real time whenever new characters are requested. in html5 we could generate atlases at compile time via macros. additionally, once multisheet atlases

this might be overkill, a simpler solution is to popularize something like Angelcode's BMFont tool that converts ttf files to bitmap fonts. I think BM font can be run via terminal commands, so maybe that's a route to go.

more info incoming

related:
https://github.com/HaxeFlixel/flixel/issues/2710

Start by reading the related issue #2710 and locating the existing FlxText and FlxBitmapText implementations. The issue needs a concrete approach and acceptance criteria before work can be considered done, since it currently presents several possible directions without naming files, tests, or a selected solution.