Move internal-use functions from experienceAnalysis #49
Description
The three experienceAnalysis functions plot_best_estimators, prep_all_pipeline_tuning_results & prep_best_estimators are not generic and can only be used in pxtextminingdashboard and only if you know what you are doing. See https://github.com/CDU-data-science-team/experienceAnalysis/releases/tag/0.2.1.
I had put them in experienceAnalysis because in early development days I was not yet sure how this package would evolve. The final form of experienceAnalysis is of a package that offers convenience functions for text mining and for a few generic classifier performance tools (e.g. plot_confusion_matrix()).
Thus, plot_best_estimators, prep_all_pipeline_tuning_results & prep_best_estimators seem out of place and I much prefer to have them in the dashboard's utils_helpers.R