Persistent state, complex images, DPC #27
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…ays CoM using color wheel, update virtual image display routines to handle complex numbers
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This adds some persistence of state across runs, currently maintaining the same window size and autorange settings. The data is stored in a platform-dependent location using a Qt settings INI file.
This also removes the "CoM Magnitude" and "CoM Angle" detector response modes, and replaces them with a single "DPC" response that displays a Lab colored image representing magnitude and phase. To support this the virtual image can now be specified as a complex array, which triggers this new rendering mode. The data cursor changes to display magnitude and phase when hovering a complex image.
Detectors that require a mask (and thus loop over each pattern) now cause a progress bar to display in the status bar, since on some datasets these can be slow.
Keyboard shortcuts are available for the vanilla loader and the py4DSTEM export: Ctrl+O and Ctrl+S