Rewrite start.sh into systemd services for more flexibile process management.

[roman-dvorak]

There is no mechanism that can automatically restart crashed software (due to an error).

One solution would be to replace the startup script with systemd.

Here is tutorial how to start systemd service after NTP sync. As replacement for used ntp-wait.

Systemd can "branch" processes one after another. For example, it restart all processes (in row) when the 1st process crash.

It also contains timers that can call/start process periodically. That would simplify DataUploader, for example.