Improve error messages from C#9784
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Inspired by #6667 (comment)
NotSupportedErrorfor operations that are currently not supported; derives from bothValueErrorandNotImplementedErrorfor backward compatibility.NotImplementedErrorallows for try-excepting in tests, so we can do better than (e.g.)Tests.test_image_filter.test_sanitywhere the test just quietly does nothing when a mode combo is not (yet, or currently) supported. (This wasn't wired up here yet.)ImagingError_*()C APIs now all support an optional message text, and message texts were added where practical. No longer "image has wrong mode" or "images do not match" for everything! ✨