## Description:
More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).
## Checklist:
- [ ] The code change is tested and works locally.
- [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**
* Changed sensor attributes for GPS
the sensor is now using the correct attributes (latitued and
longitued) which enables them to show up on the map.
* added option to display the sensor on the map
the configuration will be extended by the optional 'show_on_map' flag.
Default is not display the sensor on the map.
* making the change non-breaking: old default behaviour
* removed doubled attributes for lat and lon
* Add sensor platform for luftdaten.info
* Add monitored conditions to platform schema
* Make monitored conditions config obligatory
* Improve inline documentation
* Import first standard libs then 3rd party libs
* Combine resource url using format
* Remove unnecessary try..except block
* Use state “None” instead of STATE_UNKNOWN
* Minor changes incl. removal of unused vars
* Add missing spaces
Paulus Schoutsen
Ville Skyttä
Fabian Affolter
Paulus Schoutsen
Christoph Gerneth
lichtteil