`bob run` restart behaviour

[Equanox]

The tui spawned by bob run allows to restart the whole environment (hard-restart) using ctrl+r. This will trigger a rebuild and a shutdown of the whole environment + rampup. In case of a compose task it could be handy to only restart changed containers aka soft-restart (docker-compose up can do this out of the box).

• Always run the complete build (already implemented)
• Do not run pre&post scripts on a soft-restart
• Tab aware ctrl-r OR More Generic: track the binary checksum on start and restart only on change (docker-compose already does this). How to do this for cmd:? Probably ignore on restart?
• Don't run docker-compose down by default #98