Complete HighchartsBarStates interface. Add Color interface (#11505)
Complete HighchartsBarStates interface. Add Color interface (#11505)

- HighchartsBarStates interfaces didn't include `borderColor` and `color` properties, as documented in http://api.highcharts.com/highcharts/plotOptions.bar.states.hover
- A Color interface was added, since the documentation refers many times to `Color` as a type. This colors can be either a string or a gradient, as stated in http://www.highcharts.com/docs/chart-design-and-style/colors. The introduction of this type should help alleviating the errors currently present where certain "color" properties are only allowed to be strings.
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