Core/Spells: Port refactors from 1826437c09

(cherry picked from commit 1826437c09)

src/server/game/Spells/SpellMgr.h

@@ -357,7 +357,7 @@ struct SpellThreatEntry
     float       apPctMod;                                   // Pct of AP that is added as Threat - default: 0.0f
 };
 
-typedef std::map<uint32, SpellThreatEntry> SpellThreatMap;
+typedef std::unordered_map<uint32, SpellThreatEntry> SpellThreatMap;
 
 // coordinates for spells (accessed using SpellMgr functions)
 struct SpellTargetPosition