FIX: Tray menu: Fix callback handling for message clicked & activation events.
FIX: "pyApp.bringToFront()": Use "QWidget.activateWindow()" to get focus.
Merge branch 'master' into python2.7

- FIX: "pyApp.bringToFront()": Use "QWidget.activateWindow()" to get focus.
- FIX: Tray menu: Fix callback handling for message clicked & activation events.