fix: Consolidates Color/Center html (#1762)

### Summary
- Fixes bad color in virtual check gump
- Consolidates the Color/Center html strings for all gumps

Projects/UOContent/Mobiles/PlayerMobile.cs

@@ -35,7 +35,6 @@ using Server.Spells.Seventh;
 using Server.Spells.Sixth;
 using Server.Spells.Spellweaving;
 using Server.Targeting;
-using Server.Utilities;
 using BaseQuestGump = Server.Engines.MLQuests.Gumps.BaseQuestGump;
 using CalcMoves = Server.Movement.Movement;
 using QuestOfferGump = Server.Engines.MLQuests.Gumps.QuestOfferGump;

Projects/UOContent/Mobiles/Special/Paragon.cs

@@ -1,6 +1,5 @@
 using System;
 using Server.Items;
-using Server.Utilities;
 
 namespace Server.Mobiles;
 

Projects/UOContent/Mobiles/Vendors/BeverageBuy.cs

@@ -1,6 +1,5 @@
 using System;
 using Server.Items;
-using Server.Utilities;
 
 namespace Server.Mobiles
 {

Projects/UOContent/Mobiles/Vendors/GenericBuy.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using Server.Items;
-using Server.Utilities;
 
 namespace Server.Mobiles
 {

Projects/UOContent/Mobiles/Vendors/NPC/AnimalTrainer.cs

@@ -457,7 +457,7 @@ namespace Server.Mobiles
                     }
 
                     AddButton(15, 39 + i * 20, 10006, 10006, i + 1);
-                    AddHtml(32, 35 + i * 20, 275, 18, $"<BASEFONT COLOR=#C0C0EE>{pet.Name}</BASEFONT>");
+                    AddHtml(32, 35 + i * 20, 275, 18, pet.Name.Color(0xC0C0EE));
                 }
             }
 

Projects/UOContent/Mobiles/Vendors/NPC/CustomHairstylist.cs

@@ -4,7 +4,6 @@ using System.Collections.Generic;
 using Server.Gumps;
 using Server.Items;
 using Server.Network;
-using Server.Utilities;
 
 namespace Server.Mobiles
 {