Expand modkit to include a player actor and vehicle actor that could be tested in editor.

Currently with the modkit, you can not test several of the nodes provided by the modkit in editor because there is no way to spawn a player or vehicle. An example would be to test a player joining/leaving the server, or a vehicle spawn. The only way to test your logic is by starting the map within pavlov itself which is time consuming and very difficult to debug.

Please provide tooling to spawn a player and vehicle pawn within the editor. Additionally, simulate a player joining/leaving the server.

I would even say make sure all nodes can be tested within the editor but I think this would cover a majority of the use cases for most developers.