support multiple users edit the same scene at the same time

[yyc-git]

using event sourcing

[yyc-git]

refer to:
https://www.reddit.com/r/Unity3D/comments/59l6pw/realtime_scene_editing_with_multiple_users/
LevelMerge: Collaborative Game Level Editing by Merging Labeled Graphs

should be middleware or plugin of editor!

shouldn't be the lowest architecture!

soft lock

we do a soft-lock on selected objects. The first person to select an object gets the lock and can edit it. No one else can make a modification to that object until it is unselected or the user leaves the session