feat(Core/Chat): new argument parsing and unify chat hyperlink parsing (#6243)

src/server/shared/SharedDefines.h

@@ -278,6 +278,16 @@ const uint32 ItemQualityColors[MAX_ITEM_QUALITY] =
     0xffe6cc80         //LIGHT YELLOW
 };
 
+size_t constexpr MAX_QUEST_DIFFICULTY = 5;
+uint32 constexpr QuestDifficultyColors[MAX_QUEST_DIFFICULTY] =
+{
+    0xff40c040,
+    0xff808080,
+    0xffffff00,
+    0xffff8040,
+    0xffff2020
+};
+
 // ***********************************
 // Spell Attributes definitions
 // ***********************************