Core fix for inconsistent list object for station preferences

Core fix for inconsistent list object for station preferences
Added stationdefaults preference (apply default settings to all stations)
Added stationfolder preference (generate stations automagically from a folder structure)
Added stationconfig preference (load other preference files as stations)
Moved get_conf_dict to utils.py
Added documentation for the stationdefaults preference
Added documentation for the stationfolder and stationconfig preferences (deefuzzer_doc.xml only)

Signed-off-by: achbed <github@achbed.org>