Drawing with custom function on p5.Graphics layer

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@Hapiel

function ngon(x, y, sides, sz, star = false, ins_ = sz/2, midPos = 0.5) {

You can request the layer canvas as an extra argument for your ngon() function:
function ngon(x, y, sides, sz, star = false, ins_ = sz/2, midPos = .5, pg = p5.instance) {

Now prefix all drawing-related methods w/ that pg parameter:

• push(); → pg.push();
• beginShape(); → pg.beginShape();
• vertex(x, y); → pg.vertex(x, y);