A couple of bug fixes

This pull request contains a couple of bug fixes.

First, touch input stopped working properly because `justReleased` was never being set to true. Turns out this is because `FlxTouchManager` used `input.released` to reset the touch, which is now true one frame too early. Now it uses `released && !justReleased` instead.

Secondly, if a `FlxTypedButton` has the label set after it's position, there is a one frame delay of the label being in the right position. To fix this, I've made the label position update after the label is set. I've moved the label positon updating into `updateLabel()`.