pothos-widgets: added range controls to freq domain plots
pothos-widgets: use DoubleSpinBox for range controls
pothos-widgets: added zoomer and mouse press accept
pothos-widgets: allows for dragging from QGroupBox title
pothos-widgets: move mouse event accept into common class
pothos-widgets: zoomer needs to reinitialize the axes
pothos-widgets: combine zoomer and picker, add to wave plotter
pothos-widgets: added autoscale to Periodogram
pothos-widgets: window function property support
pothos-widgets: moved window function update into 1-time call
pothos-widgets: simplify window size update
pothos-widgets: moved support files into custom library
pothos-widgets: cleanup window function calls
pothos-widgets: display tweaks, hide graph params
pothos-widgets: bounds protection on plot picker zaxis