BETA: Implementing missing castle siege time change feature.

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6275 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad
BETA: Castles that has two artifacts (Like Goddard) are taken by single engrave on one of artifacts not requiring to have casted on both.
	* Also adding missing system message broadcast when castle is taken.
		* Thanks to: Tryskell
	* Reported by: Nos

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6276 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad