Added FisheryLib.Collections.FishTable and Mono.Cecil extension methods

A bit of refactoring has been done too

Source/FisheryLib/Diagnostics/Attributes/UnscopedRefAttribute.cs

@@ -0,0 +1,38 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Diagnostics.CodeAnalysis;
+
+/// <summary>
+/// Used to indicate a byref escapes and is not scoped.
+/// </summary>
+/// <remarks>
+/// <para>
+/// There are several cases where the C# compiler treats a <see langword="ref"/> as implicitly
+/// <see langword="scoped"/> - where the compiler does not allow the <see langword="ref"/> to escape the method.
+/// </para>
+/// <para>
+/// For example:
+/// <list type="number">
+///     <item><see langword="this"/> for <see langword="struct"/> instance methods.</item>
+///     <item><see langword="ref"/> parameters that refer to <see langword="ref"/> <see langword="struct"/> types.</item>
+///     <item><see langword="out"/> parameters.</item>
+/// </list>
+/// </para>
+/// <para>
+/// This attribute is used in those instances where the <see langword="ref"/> should be allowed to escape.
+/// </para>
+/// <para>
+/// Applying this attribute, in any form, has impact on consumers of the applicable API. It is necessary for
+/// API authors to understand the lifetime implications of applying this attribute and how it may impact their users.
+/// </para>
+/// </remarks>
+[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Parameter,
+	Inherited = false)]
+internal sealed class UnscopedRefAttribute : Attribute
+{
+	/// <summary>
+	/// Initializes a new instance of the <see cref="UnscopedRefAttribute"/> class.
+	/// </summary>
+	public UnscopedRefAttribute() { }
+}