fix(Core/Spell): Improvements to path generation for Charge mechanic (#11534)

It has its flaws but it can be improved and it's actually a lot better than what we currently have.

src/server/game/Spells/Spell.h

@@ -544,8 +544,6 @@ public:
 
     UsedSpellMods m_appliedMods;
 
-    PathGenerator* m_pathFinder; // pussywizard: for precomputing path for charge
-
     int32 GetCastTime() const { return m_casttime; }
     bool IsAutoRepeat() const { return m_autoRepeat; }
     void SetAutoRepeat(bool rep) { m_autoRepeat = rep; }
@@ -770,6 +768,7 @@ public:
 
     bool m_skipCheck;
     uint8 m_auraScaleMask;
+    std::unique_ptr<PathGenerator> m_preGeneratedPath;
 
     // xinef:
     bool _spellTargetsSelected;