organize CilboxSceneBasis, add CilboxPropBasis, modify BasisLocalPlayer

[BoatFloater]

A few cilbox related changes in this PR.

• CilboxSceneBasis
  • I sorted all the types allowed. This should make it easier to edit and review the whitelist (well, after this PR..)
  • The only actual change to the whitelist is BasisLocalPlayer with tight restrictions:
    • GetPositionAndRotation, Teleport, Respawn, get_Instance
• CilboxPropBasis
  • I saw that the content police for props currently reference the CilboxScene from the Cilbox package, but it's probably better to control the rules internally to the Basis project, so I created CilboxPropBasis with the exact rules from CilboxScene unchanged.
• PropContentPoliceSelector
  • Reference CilboxPropBasis instead of CilboxScene
• BasisLocalPlayer
  • Add GetPositionAndRotation
  • Change Instance from a field to a field accessor with private setter
    • Generally this is source-compatible but binary incompatible, so I can approach this another way if you'd like.

[dooly123]

thankyou for the time put into this