Moved all network group and subscription shit into the Facepunch dll
Subscriptions now updated at the same time as network group
Player's snapshot is now sent `full`
Fixed game objects not destroying properly
Added SpawnPoint class
Replaced respawn coroutine - now linear
Fixed player re-spawning twice
Fixed inaccuracies in NetworkVisibilityGrid debug drawing
Moved VisibilityProvider logic to Facepunch dll
Removed INetworkable
Removed MutedConnection logic
Removed NetworkVisibility class