Add Ctrl-Tab to switch tabs in chronological order

Summary:
This patch adds the possibility to navigate between the last
accessed tabs with a keyboard shortcut.

Test Plan: Open several tabs, use Ctrl-Tab to switch to the previous used one.

Reviewers: #konsole, hindenburg

Reviewed By: #konsole, hindenburg

Subscribers: hindenburg, ngraham, konsole-devel

Tags: #konsole

Differential Revision: https://phabricator.kde.org/D16884