BETA: Enforcing IIdentifiable interface.

'''Note:''' If you get errors on your custom scripts after synchronizing, just check and change methods from getXXXId() to getId().

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6149 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad