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/Benchmarks/Benchmarks.csproj

@@ -6,6 +6,7 @@
         <PlatformTarget>x64</PlatformTarget>
         <LangVersion>9</LangVersion>
         <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <SkipLocalsInitiAttribute>true</SkipLocalsInitiAttribute>
     </PropertyGroup>
     <ItemGroup>
         <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />