pothos-widgets: added constellation plotter
pothos-widgets: organize titles and axis enables into plot tab
pothos-widgets: register buffer type in constellation
pothos-widgets: typo fix in spelling
pothos-widgets: clipping for zoom rectangle, protects raster
pothos-widgets: constellation auto-scale x-axis as well
pothos-widgets: fix race to segfault with initial raster size
pothos-widgets: fix Spectrogram setColorMap ordering
pothos-widgets: plotting widgets param tweaks and axis tab