Proper UI for Portrait Player

[SameenAhnaf]

• 1. Always show portrait videos on full screen
• 2. Show Description, Comments, Related Videos, Channel and More icons under seek bar. More icon should let you access share, download, add to playlist and others.
• 3. Short press on bottom interface should show/hide interface. Short press on any other area should pause/resume the player.
• 4. Swipe up/down bottom interface to play next/previous video.

[SameenAhnaf]

Closing in favor of #4993 and #4954