P3 RGB pixel panel

@Gordon I've checked with

shiftOut.bind(null,[R2,G2,B2,undefined,R1,G1,B1],{clk:Clock});
....
Graphics.createArrayBuffer(64,32,4,{interleavex:true});

setPixel, drawLine work fine,
but fillRect, drawRect, clear, drawCircle, fillCircle don't. Some pixel are at wrong places,
Data in buffer is wrong, easy test is

gr = Graphics.createArrayBuffer(64,32,4,{interleavex:true});
gr.setBgColor(1) ;
gr.clear();
console.log(new Uint8Array(gr.buffer,64,64));

Rotating of Ellipse, hmm no idea, I've to check. But Christmas is coming, and family is coming, ....