CustomAtribute TypeSignature nested generic type parse error

[JPaja]

Describe the bug

On custom argument

 [TypeConverter(typeof(StringBasedTypeConverter<Transform, Transform.Parser>))]

on its serialized string representation

PaintDotNet.Markup.StringBasedTypeConverter`2[PaintDotNet.UI.Media.Transform,PaintDotNet.UI.Media.Transform+Parser], PaintDotNet.Base, Version=4.302.7947.34042, Culture=neutral, PublicKeyToken=null

it breaks when it gets to + character since its expecting closed bracket or comma.

From my observation + character should handle nested types

To Reproduce

var asm = AssemblyDefinition.FromFile(@"PaintDotNet.Framework.dll");
var type = (TypeDefinition)asm.ManifestModule.LookupMember(0x0200008B); //PaintDotNet.UI.Media.Transform
var customAttribute = type.CustomAttributes[0];
Console.WriteLine(customAttribute.Signature);

Expected behavior

To print to standard output

Platform

• OS: [Windows 10]
• AsmResolver Version: [e.g. 4.8-dev]

Files

PaintDotNet.Framework.dll from Paint.Net project
https://www.getpaint.net/download.html

[JPaja]

After some investigation I found out that when starting to parse first generic argument PaintDotNet.UI.Media.Transform
with ParseTypeSpec(), and since next character will be comma
ParseTypeSpec gets confused and thinks after comma is version info

where ParseAssemblyNameSpec will eat up next 2 tokens ( , and PaintDotNet.UI.Media.Transform ) up to +.

Solution would be to stop ParseAssemblyNameSpec() from eating those 2 tokens if its invalid version info