Changed initialization style.
Recoded toggleMode.
Removed unneeded defines, function members.
Changed signal/slot connection style.
Changed foreach to c++11 style.
Fixed bug with wrong duration seconds.

Task-number: QTBUG-60627
Change-Id: Ib62f7979f2a32d629482026e0d954612b2665d66
Reviewed-by: Christian Stromme <christian.stromme@qt.io>