BETA: Cleaned up `L2NpcTemplate` removing all old AI skill getters and replacing them with a single one that takes `AISkillScope` as parameter.

Reviewed by: xban1x, !UnAfraid

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6390 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad