In TrainVectorClassifier, the input centroids kmeans paramamter (-classifier.sharkkm.incentroids) is mandatory but
even for kmeans it should not be mandatory
for other classifier, it should not be a problem as the parameter is disabled by the application, and for most wrappers it works correctly (for example the test are successful on CI), but the QGIS plugin require this mandatory parameter to be set before the execution. I think the plugin doesn't handle well the case where a ParameterGroup is inside a ParameterChoice (all the sharkkm.centroid parameter are available for all classifiers)
With this MR :
classifier.sharkkm.incentroids is not mandatory anymore
the classifier.centroid group has been removed and remplaced by individual parameters.
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