3.8.3

added feature to close tabs with the middle mouse button (CDockManager::MiddleMouseButtonClosesTab) #360
added new CDockWidget flag DeleteContentOnClosethat will delete the contained widget and recreate it from a factory when closing and opening the dock widget
added method to add dock widget to dock container #398
CMake: Allow version to be explicitly set without requiring git #384
fixed and improved focus highlighting functionality - it does not steal focus anymore #334
improved initial size of floating dock widget
upgrade of PyQt build (luelista #404)
fixed Qt 5.15 build
fixed #351 - Floating dock widget container is not destroyed instantly when view is redocked
fixed #366 - crash when adding closed dock widgets to the manager
fixed: prevent middle mouse button click from closing unclosable tabs
fixed #350 - Linux: Layout system stuck (ruffianhy #401)
fixed #399 - nullptr access
fixed #368 - crash in CDockFocusController caused by invalid dock widget pointers
fixed #378 - Don't show empty floating containers on startup (BenHetherington)
fixed #380 - Hide the DockManager does not hide the floating widgets (jporcher #383)
fixed #352 - CMake: Allow version to be explicitly set without requiring git (rminderhoud #384)
fixed #420 - Floating widget title doesn't update if DockWidget->setWindowTitle() is called
fixed #437 - CustomCloseHandling depending on DockWidgetDeleteOnClose (bjb-work #438)

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