* Make component factory use frozen collections
* Fix integration tests
* Also freeze _entTraitDict
* A
* I love integration test setup logic
* Re-add public method
* Freeze event bus
* Remove per-component dictionary lookup on EntAddComponent
* release notes + fix test jank
* Fix merge
* fix tests
* Shutdown
* 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).