first update towards typedarray usage in matrices\n This was done with some simple replaces it doesn't work yet

This is now done as method of Matrix3 object which gets as a parameter Matrix4 object to be inverted (to be consistent with how Matrix4 => Matrix4 inversion is done).

As per discussion in #1615.

Added some vars. The compiler is already optimising this so there is no point on doing this risky pattern anymore.

Matrix4's static methods makeFrustum, makePerspective, makeOrtho are now normal non-static public methods. Fixes #1615.

Renamed Matrix4's setTranslation, setRotationX, setRotationY, setRotationZ, setRotationAxis and setScale to makeTranslation, makeRotationX, makeRotationY, makeRotationZ, makeRotationAxis and makeScale. Fixes #1615.

Emulating telephoto lens with focal length close to human eye.

Should fix issue #1647

CanvasRenderer .setClearColor() and .setClearColorHex() now sets opacity to 1 when null. Fixes #1636.