Merge pull request #1 from d3athrow/Bleeding-Edge

updating
Added EX Grenades.
EX Grenades are large grenades that can hold 3 reagent containers.
They can be reproduced in R&D.
Fixed issues with playsound() and corrected my .dme' FILE_DIR defaults.
Actually fixed playsound() issues this time
and added the ability enter a mecha by dragging your sprite onto it.
Merge pull request #446 from VelardAmakar/master

EX Grenades & Mecha Access