Bugfixing and small enhancements for weather display
Summary:
- Fix compile problem for older QT versions on QDateTime back to toTime_t
- Alert and warning timer is only started when at least one action is selected
- Add time to mouseover of the sensor graph
- Changed graph to solid line instead of scattered
Reviewers: mutlaqja
Reviewed By: mutlaqja
Subscribers: kde-edu
Tags: KDE Edu
Differential Revision: https://phabricator.kde.org/D24702