Small implementations for HaxeFlixel

[Just-Feeshy]

The minor fix is to make the width for FlxText change the field width, too. When you decrease the regular width, the text won't be offset to the right.

[Geokureli]

Currently haxeflixel has a problem where there is a confusing lack of distinction between a sprite's "graphic" size and it's "collision" size, and we're aiming to make them more distinct: #2667

I fear this is a step in the wrong direction, a text's collision width has different uses than it's graphical width. Also, it might be helpful for a majority of use-cases but I don't think we should make it more difficult to have a different fieldWidth and collision width.

also there's a lot of proposed changes that may make this change unnecessary very soon.

just use fieldWidth, especially if you're not colliding the text with anything

[Just-Feeshy]

Thank you, I appreciate you bringing up the potential issues with the proposed change, and I will carefully consider the impacts before making further comments. Thank you for your feedback and understanding.