This allows e.g. utils.utils.run_async to offload long-running functions
to a completely different subprocess entirely, offering real parallelism.
Implementation is still experimental, notably not all objects can be
transferred safely across the wire; also there is no concept of
updating caches yet - so adding an object from the subprocess side
will not be known in the main thread yet (since caches cannot yet tell
the underlying database has changed).
As part of this work, I have also written full listings of all available properties on Typeclassed objects (including those inherited in various ways). Should hopefully make things easier to find.
One can of course still import things directly from src/ as before. But this is a first step towards removing the "base" objects in game/gamesrc and instead making those accessible through the core API.
