Replace hardcoded client(100) and server side (255) level limtation values by defines.

src/shared/Database/DBCEnums.h

@@ -19,6 +19,14 @@
 #ifndef DBCENUMS_H
 #define DBCENUMS_H
 
+// client supported max level for player/pets/etc. Avoid overflow or client stability affected.
+// also see GT_MAX_LEVEL define
+#define MAX_LEVEL    100
+
+// Server side limitation. Base at used code requirements.
+// also see MAX_LEVEL and GT_MAX_LEVEL define
+#define STRONG_MAX_LEVEL 255
+
 enum AreaTeams
 {
     AREATEAM_NONE  = 0,

src/shared/Database/DBCStructure.h

@@ -741,6 +741,7 @@ struct GlyphSlotEntry
     uint32  Order;
 };
 
+// All Gt* DBC store data for 100 levels, some by 100 per class/race
 #define GT_MAX_LEVEL    100
 
 struct GtBarberShopCostBaseEntry