basic: added color panes and moving lights; utilities: added shapes; weird: added piet (doesnt scale)

utilities/shapes.glsl

@@ -0,0 +1,6 @@
+vec3 circle(in vec2 _st, in float _radius, vec3 color){
+    vec2 dist = _st-vec2(0.5);
+    return color-smoothstep(_radius-(_radius*0.02),
+                         _radius+(_radius*0.02),
+                         dot(dist,dist)*4.0);
+}