Some properties still have NotImplementedExceptions

[JeroMiya]

Even with method bodies turned on in config, some properties still get transpiled to throw NotImplementedException, for example:

https://github.com/JeroMiya/xamarin.flutter/blob/master/FlutterSDK/src/Foundation/Diagnostics.cs#L798

    public virtual int SubtreeDepth { get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } }
    public virtual bool IncludeProperties { get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } }
    public virtual bool ExpandPropertyValues { get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } }