Remove dead code in TerminalDisplay
Summary:
A lot of methods that no one called, a lot of methods that the
only calee could be removed to a direct call.
Reviewers: Konsole, hindenburg, ngraham
Reviewed By: Konsole, hindenburg
Subscribers: sandsmark, konsole-devel
Tags: Konsole
Differential Revision: https://phabricator.kde.org/D18520