fix: Fixes issue with cached static gump strings. Fixes bad gump colors (#1771)

### Summary
- Fixes an issue that causes CUO to crash due to bad string caching in static gumps
- Fixes wrong/bad 16bit html gump hues.
- Moves `C16232` (16-bit to 32-bit) and `C32216` (32-bit to 16-bit) to Utility class for broader use.

TODO:
- Some gumps have different 32bit (for string content) vs 16bit (for localized content) strings. Does this matter?

Projects/UOContent/Engines/ML Quests/Objectives/BaseObjective.cs

@@ -56,7 +56,7 @@ namespace Server.Engines.MLQuests.Objectives
 
         public static void WriteTimeRemaining(Gump g, ref int y, TimeSpan timeRemaining)
         {
-            g.AddHtmlLocalized(103, y, 120, 16, 1062379, 0x15F90); // Est. time remaining:
+            g.AddHtmlLocalized(103, y, 120, 16, 1062379, 0x5F90); // Est. time remaining:
             g.AddLabel(223, y, 0x481, timeRemaining.TotalSeconds.ToString("F0"));
             y += 16;
         }