There are still some issues with rotations of the elbow pole vectors.
* When the (hand - shoulder) vector approaches the normal vector used in Rig::calculateElbowPoleVector() unexpected twists can occur.
* Also, when the (hand - shoulder) vector approaches zero, the IK system starts to flutter between two states.
* The shoulder twist constraint probably needs to be opened up for more natural range of motion.
* Navigation walk speed has been reduced
* Tuned IdleToWalk timescale and interp time to reduce foot sliding
* Tuned fwd, back and lateral characteristicSpeeds to better match the
animations. This reduces foot sliding when moving forward and backward.
* Reduced rig state machine hysteresis to 1/60th of a second.
* idle is less masculine and works better on prescilla & art3mis avatars.
* idle to walk transition is updated to work with this new idle.
* turn in place animations are improved.
* fly animation is more symmetric.
Improves FTUE, by no longer going over the network to download default avatar animations.
This also includes support for relative animation urls within the animation.json
