Updated Bullet Efficiency

Removed a bunch of unecessary code (For example one was that the player would've gotten an arrow when he/she would've walked into the bullet when it was on the ground.), possibly fixed the server crash bug by changing the damage source to generic, made bullets be able to destroy more blocks and made them actually DESTROY and not REPLACE blocks.
Merge pull request #3 from MaxFF/patch-3

Updated Bullet Efficiency