Final solution for Simple Desk synchronization.

Note that HTP is in order when it comes to lower a value set by a Virtual Console widget.
Also, Simple Desk, overrides a VC channel. So use it carefully.
Feedbacks welcome :)
ArtNet plugin: extract network interfaces info and expose a proper number of outputs
Merge pull request #38 from pheerai/fixtures

Added Fixtures for:
Futurelight MH660
Eurolite LED Par64 RGBA
Stairville LED Par56 MKII RGBA
Stairville LED Par56 MKII RGBW
Updated changelog and contributors
Fixed fixture-definition Stairville LED Par56 MKII RGBW:
* Added "white"-channel to modes
Fixed Stairville LED Par56 MKII RGBW
* Added white channel to modes
Fixed fixture-definitions for Stairville LED Par56 MKII RGBA/W
* Added "white"-channel to modes
* Changed descriptions