Default argument when project name not given

[Hultner]

When no project name is given we should use a default one based on the following priority order (open to suggestions if someone got a better alternative).

1. Current working directory
2. Current git root
3. Last used project (will need some sort of state, might skip initially)
   Could actually probably just store a /tmp-file since it's probably not interesting after reboot anyway.
4. First in list of loaded projects