Refactor package filename to handle-* fetch-* and output-*

[pvdz]

Started to realize an emerging pattern;

Command file does initial handling, then usually fetches (or collects) data before displaying (or transmitting) it.

Going to make that more consistent in all commands, here's a sample: use handle- for the "bridging" file. Basically this is the command being invoked without the input handling/validation. Or put differently, everything that happens after dry-run exits.

Then there's a fetch-* file for collecting the data from the API. This may be different for files that collect data from disk or whatever but at least most of the "get-" should become "fetch-".

And the last file is output-* to display the result to the user, or to write it to disk or something.

I suspect that most fetch- stuffs can be abstracted pretty decently as part of our sdk interface, but there are some edge cases to take care of so we'll see if that holds.

Also updated some logic to be able to test locally.