Core/Players: Implemented secondary stat diminishing

Port From (https://github.com/TrinityCore/TrinityCore/commit/cb47605235a49bb2c6065b2e6de69b657a9c905f)

Source/Framework/Constants/CliDBConst.cs

@@ -2152,4 +2152,24 @@ namespace Framework.Constants
         None = 0,
         Disabled = 0x1
     }
+
+    public enum GlobalCurve
+    {
+        CritDiminishing = 0,
+        MasteryDiminishing = 1,
+        HasteDiminishing = 2,
+        SpeedDiminishing = 3,
+        AvoidanceDiminishing = 4,
+        VersatilityDoneDiminishing = 5,
+        LifestealDiminishing = 6,
+        DodgeDiminishing = 7,
+        BlockDiminishing = 8,
+        ParryDiminishing = 9,
+
+        VersatilityTakenDiminishing = 11,
+
+        ContentTuningPvpItemLevelHealthScaling = 13,
+        ContentTuningPvpLevelDamageScaling = 14,
+        ContentTuningPvpItemLevelDamageScaling = 15,
+    }
 }

Source/Framework/Database/Databases/HotfixDatabase.cs

@@ -461,6 +461,9 @@ namespace Framework.Database
             // GemProperties.db2
             PrepareStatement(HotfixStatements.SEL_GEM_PROPERTIES, "SELECT ID, EnchantId, Type FROM gem_properties");
 
+            // GlobalCurve.db2
+            PrepareStatement(HotfixStatements.SEL_GLOBAL_CURVE, "SELECT ID, CurveID, Type FROM global_curve");
+
             // GlyphBindableSpell.db2
             PrepareStatement(HotfixStatements.SEL_GLYPH_BINDABLE_SPELL, "SELECT ID, SpellID, GlyphPropertiesID FROM glyph_bindable_spell");
 
@@ -1379,6 +1382,8 @@ namespace Framework.Database
 
         SEL_GEM_PROPERTIES,
 
+        SEL_GLOBAL_CURVE,
+
         SEL_GLYPH_BINDABLE_SPELL,
 
         SEL_GLYPH_PROPERTIES,