- Added a wrapper class that handles the individual wrapping of event handlers to individually handle exceptions - now it tracks the wrapped event handlers so it can unregister them properly
- Fixed an exception that happened when two ECS objects were created with the same EGID
- Added support for returning an existing ECS object if it exists instead of always creating a new one
- Added a parameter to the entity query extension methods to override the group of the ECS object (could be used for the player properties)

ECS objects are stored in a newly created weak dictionary so that events can be called on them and possibly other things can be done with them

Added extension methods to query data from ECS objects
Added base class for ECS objects
Added support for representing in-construction ECS objects with an OptionalRef<T>

Added some TODOs as well

Newly created blocks use the initializer to set properties, allowing the user to set per-block properties