add ability to record gameplay

Requirements:
- should be able to start and stop recording
- should be able to list, play and download recorded videos
- be able to stream to youtube or twitch

I tested a command-line recording software called `byzanz` that I thought could be used to implement this feature, but it was unstable and couldn't record more than a few seconds at a time before crashing.

Any other command-line screen recording software available for Linux?

No source files, tests, or entry points are named. Start by reviewing the existing project structure and researching stable Linux command-line recording tools beyond byzanz. Done should cover the stated start/stop, list, play, download, and YouTube or Twitch streaming requirements.

Written by the indexing model from the issue text.