Add "tab autocomplete" to `asgsh` commands that take file paths

[wwlwpd]

Implementing this would provide a substantial improvement to the shell's workflow efficiency.

https://askubuntu.com/questions/68175/how-to-create-script-with-auto-complete

Initial commands to target include:

• clone profile
• rebuild profile
• define config

[wwlwpd]

define config has been completed and already merged in #835