static makeRotation(angleInRadians) {
        const c = Math.cos(angleInRadians);
        const s = Math.sin(angleInRadians);
        return new Mat3([
            c, -s, 0,
            s, c, 0,
            0, 0, 1,
        ]);
    }
@function makeRotation
@memberof OpenSeadragon.Mat3
@static
@param {Number} angleInRadians The desired rotation angle, in radians
@returns {OpenSeadragon.Mat3} A rotation matrix