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Don't accept YouTube Mix playlists

Fix search errors detection and refactor search tests

Fix YouTube videos with no views

[YouTube] Fix channel with redirects directly in the response

[SoundCloud] Fix by migrating to `api-v2` and other improvements

Signed-off-by: Stypox <stypox@pm.me>

Consistent with YouTube and the documentation

They didn't have the information to calculate another next page url. So now `nextPageUrl` contains a full link with all video ids, and `getPage` takes the first part of the url (containing 15 streams) and produces another `nextPageUrl` with the remaining streams.
Also add a test for this.

Also added

Prevent NullPointerExceptions and remove duplicate code

Rewrote methods to calculate next page url and to get items from it. `api-v2` is different from `api` since the initial playlist page contains (usually) the full info of the first 3 streams and only the id of the other. Then the single tracks can be requested in batch using `/tracks?ids=id1,id2,...`.

SoundCloud client_id are changed on a regular basis now. We might want to remove the hardcoded id completely on a later point of time when client_id is changed to often

Support for non-api mediaccc links, invidious shortened links, refactor mediaccc tests