Added basic of jukebox rewrite

- Added jukebox mod, with updated API and beginning of rewriting

mods/jukebox/README.txt

@@ -0,0 +1,47 @@
+Minetest mod "Jukebox"
+=======================
+version: 1.0
+
+License of source code and textures: WTFPL
+-----------------------------------------
+(c) Copyright BlockMen (2013)
+
+
+License of music: CC0
+---------------------
+The authors are : (freesound.org)
+-cheesepuff (song1)
+-geerterig (song2)
+-rap2h (song3)
+-keffstay (song4)
+-usedtobe (song5)
+-zagi2 (song6)
+
+This program is free software. It comes without any warranty, to
+the extent permitted by applicable law. You can redistribute it
+and/or modify it under the terms of the Do What The Fuck You Want
+To Public License, Version 2, as published by Sam Hocevar. See
+http://sam.zoy.org/wtfpl/COPYING for more details.
+
+
+Using the mod:
+--------------
+
+To use the jukebox, you have to craft one. You need 8 wood and 1 diamond to craft it following way:
+
+wood    wood    wood
+wood   diamond  wood
+wood    wood    wood
+
+
+Furthermore you need Music Discs, that you can craft following way:
+
+
+  -    coal     -
+coal   gold    coal
+  -    coal     -
+
+
+Just click with a music disc in your hand on the jukebox and it will play a random song. To stop the music
+rightclick the box again and it will drop the music disc.
+