Acid Damage Fix

Redid a portion of how acid damage is applied. People were not being disfigured when sprayed, and contact with acid for some reason had a 15% chance to do ridiculous damage (~30 per spray puff), otherwise it did very little (~6). It should be more consistent now around the ~12 range per spray puff.

Glasses melt too, now.
Updated object melt probability I overlooked.
Increased sacid meltprob from 5 to 10
Increased object melt chance from meltprob*2 to meltprob*3
Merge pull request #522 from Ikarrus/acidfix

Acid Damage Fix