[nick] Migrated to cc.com like infrastructure

[SebiderSushi]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.03.24
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.nick.de/episodes/1xja87/die-legende-von-korra-nach-all-den-jahren-staffel-2-ep-29', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.03.24
[debug] Python version 3.8.2 (CPython) - Linux-5.4.35-1-MANJARO-x86_64-with-glibc2.2.5
[debug] exe versions: ffmpeg 4.2.2, ffprobe 4.2.2, rtmpdump 2.4
[debug] Proxy map: {}
[nick.de] die-legende-von-korra-nach-all-den-jahren-staffel-2-ep-29: Downloading webpage
ERROR: Unable to extract mrss url; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 797, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3.8/site-packages/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3.8/site-packages/youtube_dl/extractor/nick.py", line 191, in _real_extract
    mrss_url = self._extract_mrss_url(webpage, host)
  File "/usr/lib/python3.8/site-packages/youtube_dl/extractor/nick.py", line 180, in _extract_mrss_url
    return update_url_query(self._search_regex(
  File "/usr/lib/python3.8/site-packages/youtube_dl/extractor/common.py", line 1005, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract mrss url; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description

As it appears, nick.de was recently migrated to use the same infrastructure as cc.com.

As a result, youtube-dl no longer works with any video on nick.de
I guess copying from the cc.com extractor logic and regexes would be enough in this case?
Might as well be a good call to check any other nickelodeon or viacom backed website for continued youtube-dl support.

Some example links even though the whole site is affected:

https://www.nick.de/episodes/5gv9n1/die-legende-von-korra-das-gift-des-roten-lotus-staffel-2-ep-28
https://www.nick.de/episodes/aq2nkz/spongebob-schwammkopf-entsorgungs-irrsinn-seehasenjagd-staffel-2-ep-8
https://www.nick.de/episodes/yel6cu/big-time-rush-willkommen-zurueck-big-time-rush-staffel-2-ep-1
https://www.nick.de/episodes/yg7wwp/avatar-der-herr-der-elemente-zosins-komet-teil-3-von-angesicht-zu-angesicht-staffel-3-ep-21
https://www.nick.de/episodes/97ppz2/drake-josh-maedchen-und-andere-sorgen-staffel-3-ep-1

[SeppSpenderRind]

Since even more Nickelodeon shows were added to nick.de recently, support for this site would be really helpful! Thanks!