[Commands] Cleanup #nukebuffs Command. (#1795)

* [Commands] Cleanup #nukebuffs Command.
- Cleanup messages and logic.
- #nukebuffs now allows you to nuke all, beneficial, or detrimental buffs, also added a help menu.
- Add BuffFadeBeneficial().
- Cleanup logic in some buff fade methods.
- Fix several spots where we were using CalcBonuses() when it was unnecessary, i.e when you fade no buffs you do not need to recalculate bonuses.

* Update spells.cpp

zone/mob.h

@@ -361,8 +361,9 @@ public:
 	virtual void DoBuffTic(const Buffs_Struct &buff, int slot, Mob* caster = nullptr);
 	void BuffFadeBySpellID(uint16 spell_id);
 	void BuffFadeBySpellIDAndCaster(uint16 spell_id, uint16 caster_id);
-	void BuffFadeByEffect(int effect_id, int skipslot = -1);
+	void BuffFadeByEffect(int effect_id, int slot_to_skip = -1);
 	void BuffFadeAll();
+	void BuffFadeBeneficial();
 	void BuffFadeNonPersistDeath();
 	void BuffFadeDetrimental();
 	void BuffFadeBySlot(int slot, bool iRecalcBonuses = true);
@@ -393,7 +394,7 @@ public:
 	void DoGravityEffect();
 	void DamageShield(Mob* other, bool spell_ds = false);
 	int32 RuneAbsorb(int32 damage, uint16 type);
-	bool FindBuff(uint16 spellid);
+	bool FindBuff(uint16 spell_id);
 	uint16 FindBuffBySlot(int slot);
 	uint32 BuffCount();
 	bool FindType(uint16 type, bool bOffensive = false, uint16 threshold = 100);
@@ -421,7 +422,7 @@ public:
 	inline float GetTargetRingZ() const { return m_TargetRing.z; }
 	inline bool HasEndurUpkeep() const { return endur_upkeep; }
 	inline void SetEndurUpkeep(bool val) { endur_upkeep = val; }
-	bool HasBuffWithSpellGroup(int spellgroup);
+	bool HasBuffWithSpellGroup(int spell_group);
 
 	//Basic Stats/Inventory
 	virtual void SetLevel(uint8 in_level, bool command = false) { level = in_level; }