implemented for use in Hiero
implemented settings file save/load in nuke and hiero
priority widget can now also be changed via MMB drag and alt+LMB drag
need to re-strucure code to handle settings file properly when Nuke and Hiero instantiate the widget (Nuke when widget is called, Hiero when main UI is loaded)
hooked up various signals to saveSettingsAndTasks slot to ensure things are saved as user changes anything of importance