For https://github.com/MozillaReality/Spoke/issues/302

Use the teleport "hitPoint" instead of "newPosition" when calculating navNode. made a separate "resetPositionOnNavMesh()" function specifically for use with teleport instead of cloberring everything into "setPositionOnNavMesh()".

refactoring. Also making sure that navNode won't be null before clampStep if you try to teleport to an invalid (according to the navmesh) location.

Sometimes won't teleport you if you're trying to teleport far (e.g. very high elevation change), but at least won't teleport you into the air.

added aframe-extras navmesh/pathfinding for our character-controller; replaced nav-mesh with new, much smaller one generated with blender navigation mesh tool; limiting teleport to navmesh; moved duck to be closer to edge of table;

* model-inflator component

* Add <a-proxy-entity>

* Update a-gltf-entity and a-proxy-entity

* Update bone-visibility to use near zero scale.

* Update naf-janus-adapter to master for testing

* Update remote template

* Fix typo in data-selector

* Fix infinitely recurively attaching templates.

* Update getNetworkedEntity.

* Temp camera scale fix

* Remove a-proxy-entity

* Set player rig hips and head rotations.

* Head and hand visibility. Controller positions WIP

* Update yarn.lock

* Fix nametag transform. nametag-transform -> billboard

* Fix hand IK and watch positioning.

* Remove unused avatar assets and components.

* Re-implement avatar scaling for AR.

* Remove avatar scale from character-controller.

* Apply hand offset.

* Set some rough hand offsets for vive

* Remove setAttribute calls.

* Use hand-controls2 offset locally.

* Update audio feedback.

* Extract billboard component. Fix setting nametag on load.

* Fix GLTFCache and add setTimeout explanation.

* Inline onLoad and onError

* Made requested changes to ik-controller

* Remove middle-eye entity.

* Remove bone-visibility component.

* Fix invRootToChest

* Update networked aframe

* Pass in handState to updateHand

* Fix a-gltf-entity loading when cached.