it automatically detects inserted disks and their type, so type selector by the user is no longer needed, which allows a much cleaner GUI

I don't want this plugin selected by default, only "file".

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

This changes filename from "latest" to explicit versioned name.
As official site doesn't provide old tarballs, we use
http://code.google.com/p/live555sourcecontrol/downloads instead.

Note: when updating contrib to new version, need to get checksum from
official site, not from there! Just in case...
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Uses half hsv's value between background and foreground
(instead of mid palette color which is only revealant for drawing over
buttons colors)

Slided a bit the central point of the orange gradient to make it appear
only above 100% value.