Fix categorical variables handling

.gitignore

data/settings_template.py

src/gui_version/RandomForest_gui.py

src/gui_version/create_training_data_gui.py

src/gui_version/shire.py

src/gui_version/utilities/handle_categorical_values.py

src/plain_scripts/RandomForest.py

src/plain_scripts/check_user_input.py

src/plain_scripts/create_training_data.py

src/plain_scripts/shire.py