This currently doesn't work as CopyAndReplaceEntitiesFrom causes various errors. Tracked here: https://fogbugz.unity3d.com/default.asp?1425370_sl2paqrmfhihfo0s
This is where the rollback and bootstrap code lives.
Builds the worlds and create update system
This is where the ticking and rollback occurs.
This is minimal components and systems for a shooting game.