Implemented support for allowing most focus effects to now be usable

by NPCs (ie Heal/Damage focus, cast time, spell range ect) from
both spell buffs and items.
Rule for enabling spell focus is TRUE by default
Rule for enabling item focus is FALSE by default.

Consilidated a number of redundant client / mob functions
to use the same pathway for calculating effect values.

zone/npc.h

@@ -135,9 +135,6 @@ public:
 	void CalcNPCRegen();
 	void CalcNPCDamage();
 
-	int32 GetActSpellDamage(uint16 spell_id, int32 value, Mob* target = nullptr);
-	int32 GetActSpellHealing(uint16 spell_id, int32 value, Mob* target = nullptr);
-
 	virtual void SetTarget(Mob* mob);
 	virtual uint16 GetSkill(SkillUseTypes skill_num) const { if (skill_num <= HIGHEST_SKILL) { return skills[skill_num]; } return 0; }
 
@@ -406,6 +403,8 @@ public:
 
 	bool IsRaidTarget() const { return raid_target; };
 
+	int16 GetFocusEffect(focusType type, uint16 spell_id);
+
 protected:
 
 	const NPCType*	NPCTypedata;
@@ -446,6 +445,7 @@ protected:
 	virtual bool AIDoSpellCast(uint8 i, Mob* tar, int32 mana_cost, uint32* oDontDoAgainBefore = 0);
 	AISpellsVar_Struct AISpellVar;
 	
+	
 	uint32	npc_spells_effects_id;
 	std::vector<AISpellsEffects_Struct> AIspellsEffects;
 	bool HasAISpellEffects;