EDK: Tidied up unused bits of Fret module
EDK: Strum module now looks for fret differences
Not yet fully tested
EthernetImage: Added status text for each frame
SDK: Outputs status messages with image frames
SDK: Further tuning of positions and thresholds
Now works above sparks. Good except for glitch with yellow sustained notes
SDK: Changed crosses on screen to detector markers
I.e. now in the same shape as the detectors