Alchemy symbols: version 2

A small update on my pixel art alchemy symbols prototype! I added 16 symbols on top of the 14 of the first version. 

Some new symbols for more common substances were added, like powder or wax, as well as symbols for three metalloids: antimony, arsenic and borax. New symbols for more specific salts are also added. 

I updated the table of symbols accordingly and removed the png image from the zip file (it is now a separate download!).