Switch to pure Canvas/HTML

[HallM]

Currently, using Phaser to do much of the Canvas things, but using pure Canvas would better emulate what is available in SmallBasic.

Use different layers, one for background, one for shapes.

May also need offscreen canvas for rendering Shapes once to be placed on the shapes (like sprites) layer.

Would have to build a tween, used for Shape.Animate and the Turtle system.

For audio, use the standard HTML Audio system

For images, use the standard method of loading Image.