Improve FlxBitmapText rendering when using renderTile with clipRect

[Geokureli]

Fixes: #2710

Less drastic version of #3394

FlxSprite: fix issue where setting cliprect completely off the frame prevents it from working later
FlxBitmapText: Improve performance, memory, and allow more control via extension
FlxRect: Add contains method
FlxFrame: Add overlaps, contains and isContained methods
FlxFrame: Make constructor public
FlxColorTransformUtil: Add reset, set, multiple scaleMultipliers overloads, overloaded setMultipliers and made alpha args optional in most functions
FlxColor: Made alpha args optional in most functions

[moxie-coder]

wouldn’t this be a duplicate PR?? I don’t see any difference between the two in the commits

[moxie-coder]

oh never mind I see it

[DetectiveBaldi]

I noticed in the other pr about this topic it mentions how this could contribute to per-character text effects. Is there work that still needs to be done there? Or are there any examples already available

[Geokureli]

I noticed in the other pr about this topic it mentions how this could contribute to per-character text effects. Is there work that still needs to be done there? Or are there any examples already available

I'm planning on making examples using #3394 as it's not as feasible using this PR. Even then, since this is only usable with renderTile, it may end up being an unofficial external tool, rather than a flixel-supported feature of flixel/addons