Implement host endpoints

When running on the quest, BMBF 2 has some endpoints that are not available in the PC wrapper (and thus aren't implemented yet).

Specifically: (contains endpoints & their function/desired implementation)

• POST /api/quit: Quits BMBF (non-forcefully, unlike BMBF 1) - this could be a button in the tools tab.
• POST /api/restart: Soft-restarts BMBF (doesn't quit the APK entirely, but restarts BMBFService) - this could also be a button in the tools tab.
• POST /api/runInBackground: Enables/disables keeping BMBF running while it's not open (POST true or false as the body)
• GET /api/runInBackground: Using this and the above endpoint you could create a toggle for running in the background. Note that you should prompt the user to restart upon changing the toggle. (for the change to take effect).
• GET /api/logs: Downloads the log file. A button for this in the tools tab would be great.