Added adjust forward run and jog animations to better align with first person camera.
In some instances, such as looking down, you could sometimes see your body lead your camera.
https://highfidelity.atlassian.net/browse/BUGZ-240
* 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