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

(This is a new pr? No it isn't you saw NOTHING!)