Merge the develop to the master (#28)

* Added a world origin system (#25)

* feat: Added a utility script.

* feat: Added a world origin basement.

* feat: Sorted out all of the world origin things.

* feat: Moved a logic that calculate a pose to the system.

* feat: Added calculating average pose.

* feat: Removed no-meaning code.

* style: Removed commented out code.

* feat: Modified GUIs for testing detection.

* doc: Added comments.

* feat: Improved some GUI controls.

* feat: Added marker world anchor assets.

* feat: Changed a way to update pose when updated.

* feat: Added a world origin prefab.

* feat: Updated a network demo scene.

* feat: Added a world origin installer.

* feat: Attached a world origin installer to the context.

* feat: Renamed an interface and added a new interface.

* feat: Put a world anchor.

* feat: Added a new interface called IWorldMarkerController.

* fix: Fixed an issue that a grabber can not grab again after ungrab.

* feat: Added a new installer prefab and attached it to the context prefab.

* feat: Called an add method of the controller in an Awake-method.

* feat: Modified a marker rotation because Nreal marker detector detects a marker that has that Z-Axis is up.

Co-authored-by: edom18 <edo.m18@gmai.com>

* Added an "OnPhotonInstantiate" callback to a photon remote player (#26)

* feat: Added an interface for getting callback when a remote player is created.

* fix: Fixed a missing prefab.

Co-authored-by: edom18 <edo.m18@gmai.com>

* Fixed some network problems (#27)

* feat: Added a null check and missing check.

* fix: Fixed an issue that an avatar body will access if an avatar has been destroyed and it will not hide.

* feat: Added a way that an avatar is destroyed when a remote player has been disconnected.

* fix: Fixed issues where both an avatar system and avatar body system would access them items even if they would have been destroyed sometimes.

Co-authored-by: edom18 <edo.m18@gmai.com>

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