GDSerializer 2.0.3

Bugfixes and minor tweaks.

Bugfixes

• Serializer now properly accounts an object's members' actual types when serializing them
• Serializer no longer considers properties with compiler-generated get accessors to be non-serializable
  • Allows auto-properties to be (de)serialized as intended

Tweaks

• Serializer now uses the name "Object" on the XML element for all serialized objects
  • The Type attribute is used to record the actual type
• XMLEscape() Godot extension method is no longer used as the C# XML API does it automatically