Remove java jukebox

[randomnicode]

The Java Jukebox relies on an external library written by @biconou which hasn't been updated for newer JVMs. A bunch of the code in the library uses internal sun classes that, following modularization of Java either isn't available or isn't exposed to public anymore, which makes porting to newer JVMs slightly more difficult.

There were other issues with the tech, leading to a whole host of issues. It was never fully tested and therefore not fully integrated, and ultimately dev work on it was abandoned.

Because the original author is not responsive, and we need to keep updating airsonic for recent JVMs, we need to regretfully remove this piece of tech. Anyone who relies on java_jukebox, should stay on a previous version.

Consequences:

• All java_jukebox players will be converted to plain jukebox players
• All references to java jukeboxes will be dropped and scrubbed from the database. There is NO GOING BACK! You won't be able to install an older version of airsonic and regain java_jukebox functionality.

Fixes #625, #628, #615

[gerroon]

Does that mean that no more remote Jukebox playback functionality (play on the server) using Dsub or similar apps? Becasue I cant get the Docker container to play to the host's Pulse server.

[randomnicode]

No, the original (legacy) jukebox is still there, which is what Subsonic uses.
Only the newer partially integrated implementation attempt by Airsonic writers (java jukebox) was removed.

[BigMula11]

Does that mean that no more remote Jukebox playback functionality (play on the server) using Dsub or similar apps? Becasue I cant get the Docker container to play to the host's Pulse server.