Revert "[#960336] Add Audiour url support."

This reverts commit 7ff7fbf7a0a23e5925512e2a38631fef05e33b1c.
v2.0.52
Bug 904165 - Fix image uploader replacing thumbnail image
Fix Bug 964314 - Prevent failed soundcloud searches from crashing the server
2.0.53
[#963170] Removed json editor dialog from tracks.