Class: Glow

A configuration for glow filter. It can have these
attributes:

• color {String} The color of the glow. The string format is "#RRGGBB"


• strength {Number} The distance, in pixels, that a glow extends. Default value is 3.


• applyToLayer {boolean} When true, the filter is applied to the layer as a whole.
  When false, the filter is applied to the individual features. Default is true.