KDDockwidgets 1.3.1

Highlights of the 1.3.1 Release

• Improve restoring layout when RestoreOption_RelativeToMainWindow is used (#171)
• Improved dragging windows across screens in mixed hdpi setups
• Fixed Flag_NativeTitleBar not hidding the client title bars when restoring (#170)
• Double clicking a native title bar of a Qt::Tool window will now redock the window (#173)
• Size of FloatingWindow now accounts for the fact that it's using Flag_NativeTitleBar and
  resizes its content accordingly (#174)
• Fixed popups on overlayed dock widgets not working
• Don't restore maximized state when using RestoreOption_RelativeToMainWindow (#184)