fix(core): Optimizes strings / .NET 5 compatibility changes (#354)

- [X] Removes some string allocations (e.g. split)
- [X] Optimizes some collections
- [X] Converts insensitive to extension methods of built-ins.
- [X] Adds ordinal (case sensitive) string helpers
- [X] Fixes conditionals for in-game commands so they use Ordinal comparisons.
- [X] Replaces ToLower.Contains with InsensitiveContains
- [X] Adds ValueStringBuilder
- [X] Implements ValueStringBuilder in a few places where it makes sense
- [X] Removes the redundant Wrap function and replaces it with an optimized version
- [X] Fixes list conversions in Utility

Closes #351

Bumps release version

Projects/UOContent/Gumps/Props/SetBodyGump.cs

@@ -310,7 +310,7 @@ namespace Server.Gumps
 
                 for (var i = 0; i < m_GroupNames.Length; ++i)
                 {
-                    if (DisplayName.StartsWith(m_GroupNames[i], StringComparison.Ordinal))
+                    if (DisplayName.StartsWithOrdinal(m_GroupNames[i]))
                     {
                         DisplayName = DisplayName.Substring(m_GroupNames[i].Length);
                         break;