support init Mediaelement in Other Thread?

We often initialize a new Media Window with a New STA Thread.
But the current Version 2019.4.30 not support it

Issue Categories

• enhancement

Sugguest

i have tried to make a temp little change, and it seems to run well. I am not sure if it would make bugs.
An official support for it is maybe better.

• AudioRender.cs Updating to 3.0.1 ffmpeg.  #2 events +-
  //Library.GuiContext.EnqueueInvoke(() =>Application.Current.Exit += OnApplicationExit);
  Library.GuiContext.EnqueueInvoke(() => {
  Application.Current.Dispatcher.Invoke(() =>
  {
  Application.Current.Exit += OnApplicationExit;
  });
  });
• GuiContext.cs
  //cancel GuiDispatcher = Application.Current.Dispatcher