Bugfix: up and down had wrong mix precedence
Rock doesn't spawn anything
Step 0.9
Spawning is now a Stream
Lava mechanics changed:

Produce Lava by mostly surrounding Rock with Fire
Lava will evaporate Water, not spread over it
Cleanups
Object refactoring

-Objects can no longer control their Spawn
-Objects can now mix differently based on direction
-Mixing precedence is ordered by Object type instead of by direction
Library updates