Labels placements property as a function for the Bars strategy

[alner]

Labels placements property as a function for the Bars strategy

It will be nice to have ability to use a function for the placements property

e.g.:

labels: [{
              label: ({ data }) => data.end.label,
              placements: ({data}) => data.end.value < 0 ? [{ position: 'opposite'}] : [{position: outside}]
}]

• picasso.js: