Revamp core implementation

[debloper]

I'm considering running browser as a systemd service (instead of compositor autostart config).

It'll help in 3 ways:

• not rely on the display server, window manager or compositor (ref Wayfire Replaced - Do we know how the new environment works with the script now? #52)
• restart the process automatically without needing reboots (ref Watchdog? "If Chromium isn't running, reboot?" #41)
• have a well maintained log to check back for crashed (ref reboot system regulary #48)

I have very limited bandwidth at the moment, so no promises on when.
Feel free to send pull requests if you want the changes made faster.

[andiohn]

Yes, absolutely yes. I have memory leaks on one of the websites I'm loading, so it would be good to just 'fail silently and restart the service' instead of having to figure something else out.

[andiohn]

I just added a new issue for the pi micro, perhaps that would be a better starting point. I had another idea to put the chrome tabs into a docker container, so we can limit it's ram or priority, but perhaps that's going too far away from 'simple'