Plugins MetaChat

- Support browser sync

- Able to delete chat history

- Support private chats protected by password
- Default chat

- Add option to set sync frequency
- Add ability to test latency

Bugfixes

- Use any person atoms in a scene in Hub to join a chat. You don't have to pick an existing atom in the scene.

- Communication APIs
- Support synchronization of non-person atom
- Support local scene

Support Morph, Clothing and Hair synchronization

Support voice streaming

Fix bugs