BETA: Minor items rework:
	* Removed isConsumable() support, too hardcoded and hardly used.
	* Removed custom etc item type HERB.
		* Replaced with `hasExImmediateEffect()`.
	* Added/replaced multiple !JavaDocs.
	* Added support for immediate_effect item attribute.

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6347 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad