BETA: Reworking skills (cleanup):

	* No more...
		* "neutral" skills, all skills are "neutral" by default.
		* dynamic skill/effect type dependent "offensive" checks.
		* dynamic skill/effect type dependent "pvp" checks.
		* null names, default is empty string.
		* dynamic seven sings skill checks, is cached in boolean until is finally unhardcoded.
		* CPDAM skill type, not used anywhere.
		* skills "pvp" and "offensive"  at the same time.
		* Spoil skill handler!
		* CpDam skill handler!
		* _effectSkillType in L2Effect.
		* effectType in EffectTemplate.
		* effectType in skill XMLs.
	* effectPower=-1 lands always!
	* Fixing Sweeper effect typos!
		* Reported by: Decad, Torvitas

Reviewed by: Adry_85, MELERIX, UnAfraid