Makes it possible for ragdoll components to use animations for more lifelike movement.

There are three ragdoll animation modes:

• "limp" - the ragdoll just falls as usual
• "powered" - the ragdoll uses an animation to move, ie rotate its limbs. It still falls down as usual, but has some force in it's joints.
• "controlled" - the ragdoll is fully kinematic and follows the animation accurately. This should only be used for a short time to make the ragdoll animation more artistic, but it should switch to the powered or limp mode soon after, to have the physics engine take over.

Modes can be switched at any time and usually markup in animation clips would be used to determine when there's a good time to switch. However, once a ragdoll goes limp, it can't go back to another mode, since this disables animation sampling.