back to legacy lot ids & add more original scrapers

[defgsus]

All lots need to have the same ID as it was generated in the original ParkAPI by the geojson wrapper. (As discussed in issue #1)

In essence that means:

• start with legacy city name (e.g. frankfurt instead of frankfurt-am-main)
• no spaces
• use utils/strings/name_to_legacy_id to convert the name strings
• new scrapers can use utils/strings/name_to_id which allows - separators

branch: feature/legacy-ids

[defgsus]

Dear @jklmnn,
adding the original scrapers is some work. It can take more than an hour for one city. However, it's progressing. I'm testing everything properly, replacing http with https and for the meta-infos i usually do a merge of scraped data and the original geojson files. E.g. in the Freiburg scraper (in get_lot_infos) the original ParkAPI geojson is downloaded from github and combined with the geojson of the Freiburg server. (Once the new geojson file is written, the get_lot_infos method is not called anymore and the code goes into an obsolete state - not needed until maybe a new lot appears within the pool. Though, once the geojson file is edited by hand this becomes more complicated..)

I also update addresses if the website supplies more complete addresses, like an added zip code. And add public or source urls for each lot where available.

Also i'm a bit more strict about the nodata status, or rather the collected numbers. If there is no free spaces or capacity number that can be scraped the values are set to None instead of zero.

For Dresden i scraped the geo coordinates from the website when available and used the ParkAPI geojson if no coords are listed. The website coordinates have more digits so i thought this might be a good thing. But i guess it's possible that you and other contributors have picked more useful coordinates by hand, so this needs to be reviewed (not only for Dresden).

Anyways, I do my best (to the best of my knowledge) to integrate the original scrapers and upgrade the meta-info where possible.

Also wrote the Frankfurt opendata people about their outage (It stopped working on 2021/12/17)

Boy, i'm really looking forward to get this project in production!

Best regards and a happy new fear