Cortical borers

All of baystation12's Borer features
+ Control of all Carbon mobs
+ different/more chemicals for borers
+ Sprites for all Directions (Why didn't bay do this?)

Reworked the hide verb to be handle_hide() so larva and borers get it without copy pasta

(Who committed FILE_DIRs? Good job I removed em!)

Thread/Poll = http://www.ss13.eu/phpbb/viewtopic.php?f=42&t=3861&p=118207#p118207