Feature/commands

[danieleborsaro]

No description provided.

[danieleborsaro]

This pull request introduces a set of functions that allow to execute subcommands while:

1. produce a consistent output
2. use the 'pretend' option
3. control the subcommand output
4. log and check subcommand execution with colourised (tags) output

This should mainly avoid chasing subcommands and manually add checks for std_DEBUG and std_PRETEND cases, all the while prettifying the output.

I have enclosed execution tags in square brackets to better visually distinguish control from subcommand outputs.

[srcshelton]

This should really have your copyright, not mine!

[srcshelton]

With what?! ;)

[danieleborsaro]

With something I did not port here from my own version of stdlib.sh :P
It's called: transcendental or astral compatibility because the function transcendentally refers to another function that lives in a non-sourced file :P

[srcshelton]

I've made some notes inline in the changes - could you also confirm that the updated script passes ShellCheck's tests?

Also, please s/color/colour/gi ;)