improve beginShape() for feature parity with Processing/p5.js

[lee2sman]

Describe the bug
beginShape() doesn't have feature parity with Processing/p5.js. Currently doesn't allow kind param and basic shape drawing should generally match basic examples from Processing/p5 beginShape() references but doesn't always.

To Reproduce
Translating the Processing beginShape() reference examples from to L5 does not always result in equivalent shape results.

Example:

Processing beginShape() example

//Processing
beginShape();
vertex(120, 80);
vertex(230, 80);
vertex(230, 190);
vertex(340, 190);
vertex(340, 300);
vertex(120, 300);
endShape(CLOSE);

L5 beginShape equivalent

  beginShape()
  vertex(120, 80)
  vertex(230, 80)
  vertex(230, 190)
  vertex(340, 190)
  vertex(340, 300)
  vertex(120, 300)
  endShape(CLOSE)

Expected behavior
beginShape() should work relatively equivalently.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
This is two issues in one! 1. Equivalency of same code 2. Adding kind param options.