[LineGraph] Be able to remove dashed line style from legends

[tomffee]

If you render too many data for graph, you're unable to see legends properly and you are forced to set withInnerLines={false}.

• AbstractChart should have new attributes for these characteristics:
• be able to render only X / Y graph lines
• be able to change strokeDasharray

[tomffee]

I checked the code, I will be able to support my ticket with PR in short period of time @Hermanya

[Hermanya]

I'm looking forward to your PR