[Feature] Change mana_used to int32 (#2321)

* Changed mana_used to use int32,
to match int32 mana_cost
This will allow higher mana costs to function

* Corrected DoHPToManaCovert to Int32

* Removed unused uint16 GetMana function call from Server/zone/questmgr.h

* Change GetSkillDmgAmt from Int16 to Int32 (SkillDamageAmount2 which uses function is Int32)

* Delete mob.cpp

* Revert "Delete mob.cpp"

This reverts commit 3db8bf04d1.

* Revert "Change GetSkillDmgAmt from Int16 to Int32 (SkillDamageAmount2 which uses function is Int32)"

This reverts commit cf5dbc9ce8.

Co-authored-by: dmcintosh-BCT <dan@blackcreektechnologies.com>

zone/spells.cpp

@@ -1288,7 +1288,7 @@ void Mob::StopCastSpell(int32 spell_id, bool send_spellbar_enable)
 // just check timed spell specific things before passing off to SpellFinished
 // which figures out proper targets etc
 void Mob::CastedSpellFinished(uint16 spell_id, uint32 target_id, CastingSlot slot,
-							uint16 mana_used, uint32 inventory_slot, int16 resist_adjust)
+							int32  mana_used, uint32 inventory_slot, int16 resist_adjust)
 {
 	if (!IsValidSpell(spell_id))
 	{
@@ -2260,7 +2260,7 @@ bool Mob::DetermineSpellTargets(uint16 spell_id, Mob *&spell_target, Mob *&ae_ce
 // only used from CastedSpellFinished, and procs
 // we can't interrupt in this, or anything called from this!
 // if you need to abort the casting, return false
-bool Mob::SpellFinished(uint16 spell_id, Mob *spell_target, CastingSlot slot, uint16 mana_used,
+bool Mob::SpellFinished(uint16 spell_id, Mob *spell_target, CastingSlot slot, int32 mana_used,
 						uint32 inventory_slot, int16 resist_adjust, bool isproc, int level_override,
 						uint32 timer, uint32 timer_duration, bool from_casted_spell, uint32 aa_id)
 {