Rewrite the C++ Demangler (#416)

* Rewrite the C++ Demangler

This new Demangler provides support to almost every possible mangled
symbols and should behaves like GNU c++filt.

It works on 98.9% of the sdk's symbols and 99.5%
of Puyo Puyo Tetris's symbols.

* Fix code style

* Fix noexcept enclosed expression parsing issues

* fix code style issues

Ryujinx.HLE/HOS/Diagnostics/Demangler/Ast/TemplateArguments.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Diagnostics.Demangler.Ast
+{
+    public class TemplateArguments : NodeArray
+    {
+        public TemplateArguments(List<BaseNode> Nodes) : base(Nodes, NodeType.TemplateArguments) { }
+
+        public override void PrintLeft(TextWriter Writer)
+        {
+            string Params = string.Join<BaseNode>(", ", Nodes.ToArray());
+
+            Writer.Write("<");
+
+            Writer.Write(Params);
+
+            if (Params.EndsWith(">"))
+            {
+                Writer.Write(" ");
+            }
+
+            Writer.Write(">");
+        }
+    }
+}