Continous wifi movement check

This integrates the code from the daily schedule_new_moving_wifi_analysis/blacklist_moving_wifis tasks into the wifi_location_update task, which runs every ~5minutes.

It avoids one huge task having to check all new wifi data for a day and replaces it with much smaller continuous checks.

Currently the old code is still in place, until I've deployed it and made sure to have all wifis for the last day checked. After that is done the old code can be removed.

@vng does this code make sense yet? :-) The TODO comments are taken over from the old code, I didn't attack those yet.