Added inWorldbounds function

inWorldbounds is a simple function to quickly ascertain if an object is within FlxG.Worldbounds or not, similar to onScreen.
Updated inWorldbounds to be inline and named inWorldBounds
Merge pull request #693 from SeiferTim/dev

Added inWorldbounds function
Fixed issue with gamepad access.
Made default font be non-inline, so it can be modified.
Reverting back changes to MultiVarTween, it caused bugs while tweening floats. We must find another way to fix the color tweening issue.
Add the addons package to the api doc generator
Revert back changes in VarTween, it caused bugs while tweening floats
Merge commit '716b5dcb7b58bc0d86b986578b2e3cc957403934'