Stookwijzer

- Create static method to convert coordinates

- Remove pyreproj dependency

- Update state values

- Change Stookalert value to boolean
- Remove the forecast tag

- Update the API to Atlas Leefomgeving
- State has changed to codeYellow, codeOrange, codeRed (according to the website)
- New properties introduced: alert (Stookalert), forecast, windspeed_bft, windspeed_ms

- Change states to lower case