Add zsh support for kdevelop konsole integration

Summary:
This is the small kdevelop part that adds zsh support.
See: https://phabricator.kde.org/D3171 for the bigger kdevplatform part.

This diff is based on a very old patch from Philipp A.:
https://git.reviewboard.kde.org/r/110298/diff/4/

Test Plan: This was tested locally and works fine.

Reviewers: kfunk

Subscribers: kdevelop-devel

Differential Revision: https://phabricator.kde.org/D3172