* Added a basic server simulation framework for help with tests.
* Moved as much as possible to Robust.Shared/Containers.
Moved ContainerSlot from content to engine.
* Moved ClientContainer to shared.
* Merged client/server ContainerManagerComponents into a single shared version.
* ContainerManagerComponent is now implicitly registered with the attributes.
* Migrated to 2021 serialization technology.
* Existing Unit Tests work.
* More tests coverage.
Fixed bug with transferring items between containers.
* Container Type info is now sent over the network.
* Merge client/server container systems.
* Code cleanup.
* Attempted to fix dictionary serialization.
Logs warning when trying to check if an unknown GridId is paused.
* Remove OldCode.
* 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.
