Enable medical belt quick pickup

Using a medical belt on a bottle will attempt to pick up all bottles on
the tile.
Medical belt can load into fridge

- Fixed compiling error with glass.dm

- Medical belt will load apropriate items into the medical fridge when
used on the fridge
Added: Pill bottle emptying into fridge

- Drag pill bottle sprite onto fridge to empty it

Code for batch filling of fridge is re-used from similar uses of plant
bag and ore bag.
Merge pull request #365 from Artorp/chemisty-changes

Chemisty quality-of-life changes