Fix many SYN_CLASS tags from forward-slashes to backslashes.
Remove unused and possibly non-operational BLOWGUN_L* inorganics

I'm not sure these would ever work, they have funny names, and
they're not referenced anywhere else.
Merge branch 'master' into nerfed_diseases

* master:
  Remove unused and possibly non-operational BLOWGUN_L* inorganics
  Fix many SYN_CLASS tags from forward-slashes to backslashes.