Add warnings for when you (I) do silly things #135
Merged
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A bunch of UI fixes to make it hopefully impossible to do various silly things I have done in the past, and/or to show warnings if settings are wrong.
If for example you set end depth to 10cm instead of -10cm, in the previous version it just silently fails. Not any more - now it shows a warning message in getLayers.
Several things that previously showed a warning in the info panel then failed now show errors properly, e.g. selecting object that isn't a curve for a curve sourced operation.
It also doesn't let you run an operation that isn't valid (e.g. deleted source object).