service/ServiceDiscovery: automatically update name servers on change
application/LocalSettings: switch to QJsonValue instead of QVariant due
to bug in Qt
applicationcontrols/ConnectionWindow: implemented automatic
configuration storage and limited name servers to 3 due to problems
service/ServiceDiscovery: fixing memory leak
application/ApplicationSettings: added preview enable option
pathview/PathView3D: using preview enable option
applicationcontrols/ApplicationProgressBar: replaced ToolButton by
TouchButton
pathview/GCodeProgramLoader: fixed wrong file path joining
pathview/GlView: deleting items on destroy, update window aspect ratio
on assignment
pathview/PathItem3D: fixed crash on path change