Add Münchner Stadtbibliothek (only SZ via munzinger.de)

[Strubbl]

This PR supersedes #184.

I am not sure about the change from hardcoded Spiegel to SZ in the munzinger search URL. Do you have any hint about how to implement this better? With a separate Sources?

The change in the extractor is done to really remove the quotes from the query parameter. This is done, because special chars are also removed and thus an exact search for the query does not reveal any results anymore.

I tested my changes successfully with the following URLs

• https://www.sueddeutsche.de/projekte/artikel/politik/lkw-unfaelle-beim-abbiegen-im-toten-winkel-e744638/?reduced=true
• https://www.sueddeutsche.de/kultur/wladimir-sorokin-gastbeitrag-putin-1.5536912?reduced=true
• https://www.sueddeutsche.de/muenchen/muenchen-kita-foerderformel-florian-kraus-kinderbetreuung-1.6320367?reduced=true

fixes #110
fixes #186
fixes #250
fixes #313
closes #184

[Strubbl]

Thanks to @darkdragon-001 for the initial start in PR 184. I reused the portalId which saved me some time.

[Pfaufisch]

@Strubbl: It looks like the Münchner Stadtbibliothek now offers access to Genios as well. If you're still working on this, I'd appreciate if you consider adding support for Genios.

[darkdragon-001]

FYI I added support via Genios in #442.