Disposal standarization and runtime fix.

Some standarization for disposals.
Added a spawn(0) before the flush() call on their process() proc because flush() includes some sleeps. You can actually restart the MC on a specific way.
The new air for disposals will be created AFTER the air is transfered to the holder, avoiding runtimes and making this feature actually work. Removed a hacky check on process() to avoid this runtime.
Someone slap donkie for me.