Summary:
This patch adds a global shortcut ({key Meta E}) to launch Dolphin, just like Konsole has.
FEATURE: 405302
FIXED-IN: 19.04.0
Test Plan:
1. Apply patch and reboot, or create and log into a new user
2. Hit {key Meta E}
3. Dolphin opens!
Reviewers: #dolphin, #vdg, elvisangelaccio
Reviewed By: #dolphin, elvisangelaccio
Subscribers: hallas, elvisangelaccio, kfm-devel
Tags: #dolphin
Differential Revision: https://phabricator.kde.org/D19831
