Add VrmImmo Crawler

[mrclrchtr]

I have just implemented the crawler for https://vrm-immo.de for my own purposes.
Maybe it can help someone else.

[codecov]

Codecov Report

Merging #467 (099e377) into main (0e099b9) will increase coverage by 0.41%.
Report is 1 commits behind head on main.
The diff coverage is 86.66%.

@@            Coverage Diff             @@
##             main     #467      +/-   ##
==========================================
+ Coverage   66.04%   66.46%   +0.41%     
==========================================
  Files          40       41       +1     
  Lines        2215     2260      +45     
  Branches      311      312       +1     
==========================================
+ Hits         1463     1502      +39     
- Misses        658      664       +6     
  Partials       94       94              

Files Changed	Coverage Δ
flathunter/crawler/vrmimmo.py	86.36% <86.36%> (ø)
flathunter/config.py	60.36% <100.00%> (+0.11%)	⬆️

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[codders]

Amazing! Thanks so much for the new crawler, and for the tests!

I see this try: except: pattern in the other crawlers too for extracting elements from the soup, and I wonder if there would be a more elegant way here (either a utility function, or a library wrapper). But maybe that's a fun refactor for me some time when I have too little to do :)