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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

[YouTube] Improve response status checks

Test if services recognizes their own items urls

Hotfixes for YouTube and improve unavailable cases

Added a test case as well.

- Added tests for these cases.

Also remove catch because it may hide bugs when the page changes.

Will be latest one in this commit because there's need to check the
history of redirects as of now.

The test implementation was throwing an exception instead of just
returning the response and letting the caller handle it.

Fix for Android versions earlier than KitKat

Improve yt_new