Add controller messages for USB redirection
Add controller messages for USB redirection

This adds 3 new controller messages:

CONTROLLER_ENABLE_USB (ControllerValue, boolean)
CONTROLLER_ENABLE_USB_AUTOSHARE (ControllerValue, boolean)
CONTROLLER_USB_FILTER (ControllerData, string)

This fixes rhbz #807295

SPICE/spice-protocol,SPICE/spice-protocol,fgouget/spice-protocol,fgouget/spice-protocol,elmarco/spice-protocol,freedesktop-unofficial-mirror/spice__spice-protocol,freedesktop-unofficial-mirror/spice__spice-protocol,Fantu/spice-protocol,Fantu/spice-protocol,dezelin/spice-protocol,dezelin/spice-protocol,vdiot/spice-protocol,elmarco/spice-protocol,vdiot/spice-protocol,SPICE/spice-protocol,dezelin/spice-protocol,vdiot/spice-protocol,elmarco/spice-protocol,fgouget/spice-protocol