BETA: GlobalVariablesManager rework.
	* Extending already existing AbstractVariables
	* Adding a hasVariables method.
	* Reviewed by: UnAfraid, Nos

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6110 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad