Fix loading channel configuration files #272
Merged
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In this PR, channel configuration files that are malformed or are missing required fields no longer throw an exception that forcibly closes the dialog. Exceptions are routed appropriately to notify the user instead.
Fixes #252
Additionally, files that contain changes other than the device channel indices are now respected. Previously, only the device channel indices were being saved, which meant that channels could be enabled and disabled by reading in a configuration file, but if the probe contour or contact shapes were modified those changes were not reflected in the GUI.
Fixes #271
Finally, an emergent property of fixing #271 led to a bug in drawing the scale bar after loading files without a probe contour. This has been addressed as well in this PR, but no issue was created for it.