Please merge this new and improved, working version of RetroPie-Manager into RetroPie.

[hifihedgehog]

I just wanted to share this working fork works which, among other things, restores x86 and x86-64 compatibility on Ubuntu 20.04 LTS, as well as bringing a slew of improvements to the table. First, a big show of thanks to @NicholasBarryman for doing all the work he did to get this excellent web interface working again! He updated the monitoring page to provide live, actively updated system information using AJAX and JSON, so things like processor core utilization and memory usage can now be viewed instantly without ever refreshing the page. He also bumped up the upload file size limit for ROM files from 256MB to 10GB which is especially useful for disc-based systems like PlayStation, Dreamcast, GameCube, PS2 or Wii.