added enemy ai
Added character.h and character.cpp which disappeared.
Merge branch 'Enemy'
Revert "Merge branch 'Enemy'"

This reverts commit 6941015367e31235841571a18a0e76e13d1ffc1a, reversing
changes made to a09bf84e61ec679963225f8e343c83f8d25f7eff.
Merge branch 'Enemy' (reverted from commit 6941015367e31235841571a18a0e76e13d1ffc1a)