Adding GSAP 1.11.6

- Added a new feature to CSSPlugin that allows you to set skewType:"simple" to get the behavior that "normal" CSS skew transforms apply which doesn't compensate on the other axis (like a 3D effect). There is also a new static CSSPlugin.defaultSkewType that can be set for a global behavior change. The default is "compensated".

- Fixed issue that could cause an error in IE8 when clicking on a Draggable.

- Fixed issue that could cause an error if clearProps:"all" or clearProps of a transform property was performed on the target of a Draggable of type "x", "x,y", "y", or "rotation".

- Fixed issue that could cause an addPause() pause to be skipped in a very uncommon scenario when running in reverse.

- Fixed an issue that could cause an addPause() or other call() that's positioned exactly at the very end of a timeline to be called upon reverse().

- Enhanced BezierPlugin so that it records the initial rotational values when autoRotate is applied so that when the parent timeline is rewound past the beginning of the Bezier tween, the original values get re-applied.

- Changed some inner workings of CSSPlugin related to transforms in preparation for an upcoming tool.