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/Server/Network/NetState/NetState.cs

@@ -84,9 +84,9 @@ namespace Server.Network
             HuePickers = new List<HuePicker>();
             Menus = new List<IMenu>();
             Trades = new List<SecureTrade>();
-            _recvBuffer = new byte[RecvPipeSize];
+            _recvBuffer = GC.AllocateUninitializedArray<byte>(RecvPipeSize);
             RecvPipe = new Pipe<byte>(_recvBuffer);
-            _sendBuffer = new byte[SendPipeSize];
+            _sendBuffer = GC.AllocateUninitializedArray<byte>(SendPipeSize);
             SendPipe = new Pipe<byte>(_sendBuffer);
             m_NextCheckActivity = Core.TickCount + 30000;