Core: Some optimizations

- Declare some functions const
- Fix some mem leak
- Fix some resource leak
- Remove unused variables and functions
- Remove duplicate functions
- Reduce the scope of some variables
- Remove unused file

--HG--
branch : trunk

src/server/game/Chat/Commands/Level2.cpp

@@ -205,7 +205,6 @@ bool ChatHandler::HandleDeMorphCommand(const char* /*args*/)
 //kick player
 bool ChatHandler::HandleKickPlayerCommand(const char *args)
 {
-    const char* kickName = strtok((char*)args, " ");
     Player* target = NULL;
     std::string playerName;
     if (!extractPlayerTarget((char*)args, &target, NULL, &playerName))