* Added unit tests for the new anchor system design.
* Amend ME!
* SnapGridComponent now anchors the entity when added or removed.
TransformComponent.Anchored properly replicates it's state to clients.
* Converted all SnapGridPositionChangedEvent subscriptions to AnchorStateChangedEvent.
Removed SnapGridPositionChangedEvent.
Obsoleted SnapGridComponent.
* Allows setting Transform.Anchored in prototypes.
* Changing tile to empty under anchored ents unanchors them.
* More unit testing.
* Migrated transform gamestate tests to RobustServerSimulation.
* Fixed nasty off-by-one error when sending a full server state.
* Adds lifetime stages to Component.
* More test fixing.
* Review changes.
* Automatically unsubscribe event bus registrations in entity system shutdown.
* Fix incorrect unsubscription of local events, obsolete unsubscribe methods.
That's what we got tests for.
* = null instead of .Clear()
* Removed SnapGridOffset, there is only center now.
* SnapGridComponent methods are now static.
* Removed SnapGridComponent.OnPositionChanged.
* Refactored static functions off SnapGridComponent to MapGrid.
Refactored away usages of SnapGridComponent.Position.
* Added Transform.Anchored for checking if an entity is a tile entity.
More refactoring for static MapGrid functions.
* Static snapgrid methods on MapGrid are no longer static.
* Removed IMapGrid.SnapSize, it is now always equal to the IMapGrid.TileSize.
* Add setter to ITransformComponent.Anchored.
Removed direct references to SnapGridComponent from content.
* Grid functions now deal with EntityUids instead of SnapGridComponents.
Began renaming public API functions from SnapGrid to Anchor.
* Add some unit tests.
* SnapGridComponent now anchors itself in startup, instead of Initialize (sending directed events in init is an error).
* Removed the Interfaces folder.
* All objects inside the GameObjects subfolders are now in the GameObjects namespace.
* Added a Resharper DotSettings file to mark the GameObjects subfolders as not providing namespaces.
* Simplified Robust.client.Graphics namespace.
* Automated remove redundant using statements.
