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/CasExpression.cs

@@ -0,0 +1,30 @@
+using System;
+using System.IO;
+
+
+namespace Ryujinx.HLE.HOS.Diagnostics.Demangler.Ast
+{
+    public class CastExpression : BaseNode
+    {
+        private string   Kind;
+        private BaseNode To;
+        private BaseNode From;
+
+        public CastExpression(string Kind, BaseNode To, BaseNode From) : base(NodeType.CastExpression)
+        {
+            this.Kind = Kind;
+            this.To   = To;
+            this.From = From;
+        }
+
+        public override void PrintLeft(TextWriter Writer)
+        {
+            Writer.Write(Kind);
+            Writer.Write("<");
+            To.PrintLeft(Writer);
+            Writer.Write(">(");
+            From.PrintLeft(Writer);
+            Writer.Write(")");            
+        }
+    }
+}