Foreach: Support jars as source

[sandersch]

If I have a jar of e.g. gems, it would be handy to be able to:

;foreach in my jar; move to pack

and have it shake the jar to remove items from it.

I don't know of a way to do this through GameObj but here is are some examples of the raw results from looking into a jar:

The black sea glass bottle is empty.

Inside the black sea glass bottle you see 4 portions of dragonsbreath sapphires.  It is mostly empty.

Inside the black sea glass bottle you see 36 portions of azure blazestars.  It is less than half full.

Inside the black sea glass bottle you see 65 portions of dragon's-tear emeralds.  It is more than half full.

Inside the glass jar you see 11 portions of crimson blazestars.  It is becoming full.

Inside the violet glass bottle you see 50 portions of brilliant lilac glimaerstones.  It is full.