Replaced old connect() with QT5 style. Part 1

Authored by mchabrecek on Oct 21 2018, 9:45 PM.

Description

Replaced old connect() with QT5 style. Part 1

  Summary:
  Replacing connect() lines with the new signal/slot syntax in Qt5. Details: https://wiki.qt.io/New_Signal_Slot_Syntax.
  There many of them. This is just the fist part, more will follow.

  Differential Revision: https://phabricator.kde.org/D16223

Details