add an animated variant of the colors shader

glsl/defaultFiles.js

void main() {
  gl_FragColor = vec4(gl_FragCoord.xy / iResolution, blue, 1.0);
}`,
  "colors2.frag": `/*
 * A shader that maps the RGB scale onto the canvas.
 *
 * Blue controls the amount of blue to mix in, or the speed with which
 * to animate from/to blue when animating.
 */
uniform float blue; //#slider[0.0,0.0,1.0]
void main() {
  if (iGlobalTime > 0.0) {
    // if animating, control the speed of the color shift
    gl_FragColor = vec4(gl_FragCoord.xy / iResolution,
                        0.5 + sin(iGlobalTime * blue)*0.5, 1.0);
  } else {
    // else just control the blue component
    gl_FragColor = vec4(gl_FragCoord.xy / iResolution, blue, 1.0);
  }
}`,
  "default.frag": `//#include "includes/sphere-tracer.frag"
//#include "includes/default-main.frag"
  gl_FragColor = vec4( col, 1.0 );
}`
};
};