Fetch actual raw streamable URLs from various radio-station, video & podcast websites.

Changes for 2.22

• Remove StreamFinder::LinkTV (site no longer hosts videos onsite).
• Mark StreamFinder::SoundCloud DEPRECIATED (now requires cookies and trackers to be enabled onsite to browse, but song URLs still work here.
• Minor module doc touchups (to note recent depreciations, etc.)
• StreamFinder::Rumble - Add -bitrate (max kbps) option.