Add arcs to milling post processor

[AndyEveritt]

This will likely need some changes the the ASMBL parser too

[Antoine505]

Hi Andy,
I'm a big fan of your work in Post-Processor.
As a newbie in the Post-Processor world, I still want to help you.
I found this into other PP for CNC with fusion and I would like to share it :

properties = {
jobUseArcs: true, // Produce G2/G3 for arcs
};

propertyDefinitions = {
jobUseArcs: {
title: "Job: Use Arcs", description: "Use G2/G3 g-codes fo circular movements", group: 1,
type: "boolean", default_mm: true, default_in: true
},
};

Firmware3dPrinterLike.prototype.circular = function (clockwise, cx, cy, cz, x, y, z, feed) {
if (!properties.jobUseArcs) {
linearize(tolerance);
return;
}
// Marlin supports arcs only on XY plane
var start = getCurrentPosition();
if (isFullCircle()) {
if (isHelical()) {
linearize(tolerance);
return;
}
switch (getCircularPlane()) {
case PLANE_XY:
writeBlock(gMotionModal.format(clockwise ? 2 : 3), xOutput.format(x), iOutput.format(cx - start.x, 0), jOutput.format(cy - start.y, 0), fOutput.format(feed));
break;
default:
linearize(tolerance);
}
} else {
switch (getCircularPlane()) {
case PLANE_XY:
writeBlock(gMotionModal.format(clockwise ? 2 : 3), xOutput.format(x), yOutput.format(y), zOutput.format(z), iOutput.format(cx - start.x, 0), jOutput.format(cy - start.y, 0), fOutput.format(feed));
break;
default:
linearize(tolerance);
}
}
}

--> It works for me.