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/DtorName.cs

@@ -0,0 +1,15 @@
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Diagnostics.Demangler.Ast
+{
+    public class DtorName : ParentNode
+    {
+        public DtorName(BaseNode Name) : base(NodeType.DtOrName, Name) { }
+
+        public override void PrintLeft(TextWriter Writer)
+        {
+            Writer.Write("~");
+            Child.PrintLeft(Writer);
+        }
+    }
+}