clean up the code to use the new classes
clean up the code to use the new classes

change the code to use the methodes of the classes introduced in the
last commits

ffrgb/ffrn-gw-splash,Freifunk-Rhein-Neckar/ffrn-gw-splash,ffrgb/ffrn-gw-splash,ffrgb/ffrn-gw-splash,Freifunk-Rhein-Neckar/ffrn-gw-splash