[processing] upgrade modeler to make use of qgsdockwidgets #3800
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Now that the modeler is a QMainWindow, we can make use of QDockWidget to allow users to customize the location of the inputs and algorithms elements. This PR does that. I also took the opportunity to relocate the modeler name and modeler's group name.
By default, the modeler now looks like this (notice the nice vertical space gain):
Thanks to panels, we can now do show both inputs and algorithms at the same time:
Or go wild:
@nyalldawson , thanks for suggesting this 😄