Add option to remove archive files when extraction was successful

[Feel-C]

Reduce the size of _extract directory
I am using unblob on large files (5Go to 8Go) and disk usage is very high : original file + _extract directory + log
The _extrract directory contains all original archive files and _extract result.

Add an option to remove all achive files (.gz, .zi, .tgz, ... ) in the _extract directory
When the extraction of a file is sucessful, the original file (.zip, .xz, .tgz, ...) is deleted in the _extract directory

[qkaiser]

We already discussed this idea at #687. It's not on our roadmap right now, but we'll definitely take your request into account since it indicates that more and more users are expecting this feature.

[qkaiser]

If you want to give it a try, we had a branch that did exactly what you want: #766