Allow for the appropriate file extension to use on files to be specified when…

Authored by bcooksley on Nov 2 2018, 5:44 AM.

Description

Allow for the appropriate file extension to use on files to be specified when managing an archive.

Make it possible to change the suffix so we can change the suffix for
the abibuilder. Otherwise humans and f.ex. vi/vim get confused by the filesuffix.

Differential Revision: https://phabricator.kde.org/D16581