[JS] JavaScript Canvas Experiments

[combatking0]

After learning a few new tricks in the UDG challenge, I have resolved to attempt the following:

1. Rotate an image and draw it onto a canvas.
2. Copy a triangular / rectangular section of an image and draw it onto a canvas.
3. Distort a triangular / rectangular section of an image and draw it onto a canvas.
4. Texture mapping.

Gourad filling is also well documented.