Native Skeleton Parents and Synced Instantiation

A new set of components that allows you to parent a-frame entities to avatar skeleton joints:

• https://altspacevr.github.io/aframe-altspace-component/doc/native.n-skeleton-parent.html
• https://altspacevr.github.io/aframe-altspace-component/doc/native.n-cockpit-parent.html

And the ability to instantiate entities that are synced across clients:

• https://altspacevr.github.io/aframe-altspace-component/doc/sync.instantiator.html
• https://altspacevr.github.io/aframe-altspace-component/doc/sync.one-per-user.html

Examples:

• https://altspacevr.github.io/aframe-altspace-component/examples/native-parents/
  • https://github.com/AltspaceVR/aframe-altspace-component/tree/v1.4.0/examples/native-parents/index.html
• https://altspacevr.github.io/aframe-altspace-component/examples/armory/
  • https://github.com/AltspaceVR/aframe-altspace-component/tree/v1.4.0/examples/armory/index.html