Merge remote-tracking branch 'CommunitySqueeze/public/7.8' into public/7.8
Changelog update
Return generic Radio image instead of 404 HTML page when image proxy
request fails.
Move LocalFile initialization from main script to
Slim::Player::ProtocolHandlers
Need to define constant LOCALFILE in all scripts
Unify artwork handling: user coverid > artwork_track_id > artwork_url in
all interfaces.

Bug: 17635 - Search results have album art instead of track art
Merge branch 'public/7.7' into public/7.8
Merge pull request #2 from Logitech/public/7.8

Public/7.8