Video player remember sound, autoplay, and other improvements

Video fixes:

• Implement auto-play for portrait viewer
• Update expo and expo-av
• Implement remember volume
• Fix auto-pause previous video with the new player
• Video player small UI improvements
• Use new player for video previews in the composer screen
• Fix autoplay for local videos (previews)

closes #2648 (closed) #2642 (closed) #2641 (closed)