Custom legend block for group

[lionel-bijaoui]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Feature

• What is the current behavior? (You can also link to an open issue here)

Legend template can't be changed

• What is the new behavior (if this is a feature change)?

Legend template can be changed with slot (named group-legend)

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No

• Other information:

  • Possibility to use scoped-slot to customize fully how legend is build
  • Expose group and groupLegend in slot prop

[coveralls]

Coverage remained the same at 73.92% when pulling b694fae on lionel-bijaoui:lb_custom_legend into 55b5d9f on vue-generators:v3.

[coveralls]

Coverage remained the same at 73.92% when pulling b694fae on lionel-bijaoui:lb_custom_legend into 55b5d9f on vue-generators:v3.