Core/Player: Use dbc data for calculating combat ratings

Closes #1156

src/server/game/DataStores/DBCfmt.h

@@ -61,6 +61,7 @@ const char GtChanceToMeleeCritBasefmt[]="f";
 const char GtChanceToMeleeCritfmt[]="f";
 const char GtChanceToSpellCritBasefmt[]="f";
 const char GtChanceToSpellCritfmt[]="f";
+const char GtOCTClassCombatRatingScalarfmt[]="df";
 const char GtOCTRegenHPfmt[]="f";
 //const char GtOCTRegenMPfmt[]="f";
 const char GtRegenHPPerSptfmt[]="f";