Add better MMSynchronizer implementations

[GuilhermeGSousa]

Right now there are two types of synchronizers:

• Clamp synchronizer: limits the distance of the skeleton from the player capsule
• Root motion synchronizer: moves the player capsule with to the skeleton's position

This gives us the two ends of controllability: one is code driven, the other data driven (root motion). Life, however, isn't this black or white, and it may sometimes be desireable to use a solution somewhere in between.

Dan Holden's awesome article gives great examples of this.