Lua changes

Changed pushPosition with pushMetaPosition
Added Party metatable
Added events folder
Merge pull request #284 from dalkon/master

Lua changes
Update protocol version to 10.3x
New outfit and mount
Merge pull request #285 from ninjahopparn/master

New outfit and mount
Reduce memory footprint of Creature

This commit also optimizes Player::getCorpse() and Monster::getCorpse().
It also fixes a bug where a player could get an unjustified kill after
justifiedly attacking a player.
Code cleanup