Core/Player: Use dbc data for calculating combat ratings

Closes #1156

src/server/game/DataStores/DBCStructure.h

@@ -961,6 +961,8 @@ struct GlyphSlotEntry
 
 // All Gt* DBC store data for 100 levels, some by 100 per class/race
 #define GT_MAX_LEVEL    100
+// gtOCTClassCombatRatingScalar.dbc stores data for 32 ratings, look at MAX_COMBAT_RATING for real used amount
+#define GT_MAX_RATING   32
 
 struct GtBarberShopCostBaseEntry
 {
@@ -992,6 +994,11 @@ struct GtChanceToSpellCritEntry
     float    ratio;
 };
 
+struct GtOCTClassCombatRatingScalarEntry
+{
+    float    ratio;
+};
+
 struct GtOCTRegenHPEntry
 {
     float    ratio;