Create 00_special_troops.txt

There was no 00_special_troops.txt, so PB was just using the vanilla special unit definitions, and didn't have the increased maintenance for camel cavalry or horse archers. Problem solved!
Delete 00_special_troops.txt
Create 00_special_troops.txt
Create 00_special_troops.txt
Merge pull request #178 from bnormoyle/beta

Beta