Generate new colors for new patterns

[jonyrock]

Would nice to have if you create patterns, than colors would be different. Its like when we create new metrics in graphs

[sankerust]

@jonyrock please review and tell what we need

https://github.com/hastic/hastic-grafana-graph-panel/pull/23

[jonyrock]

@sankerust I think it's better to start with palette of colors So you work in assumption that all your metrics have default color (user doesn`t set color to any metric) and you know what:

• green metric looks good with red patterns
• blue metric looks good with yellow patterns

and you should thing how red and patterns looks together

Then you will come up to necessary subtasks.

I think you can start with array = ['red', 'yellow', 'purple', ...] and set color for next patter corresponding next color