Add raw data to commands' outputs

[Supinic]

Long term functionality proposal

It would be quite nice to have "raw data" as a result from commands. Right now, the only way to extract any data from a command being used is to parse it out of the reply string with regular expressions and such.

If each command would return a wrapper of data all related to the execution, creating custom command chains and pipes would be a lot easier.

This discussion follows from since-archived SPM repository. For more info or context, check here: Supinic/supibot-package-manager#90

Discussed with @2547techno and @NotNotQuinn