Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensur

Is your feature request related to a problem? Please describe

I'm using Magick.net to update Exif metadata, but could not find a way, to replace the thumbnail image.

Describe the solution you'd like

I would like to be able to replace the thumbnail, by using magick.net

Describe alternatives you've considered

I have tried to make an extension method but did not find a way to

Add environment variables to make it possible to disable the following features:

• Face Recognition: PHOTOVIEW_DISABLE_FACE_RECOGNITION=1
  completely disable face recognition and hide the icon from the side menu

• Video encoding: PHOTOVIEW_DISABLE_VIDEO_ENCODING=1
  disable ffmpeg encoding, but still allow web compatiable videos that doesn't need encoding.

• **RAW processing:

Hi,

I have a huge collection of photos, and think it would be nice to get back to the last position in image list when reopening the app, some kind of session restore in a way.
Thanks a lot for your work

Raphael