Export data uses generic class names

[TorsteinHonsi]

Expected behaviour

All internal class names should be prefixed by highcharts- to avoid conflicts.

Actual behaviour

The export-data module uses classes number and empty which is likely to crash with generic classes in websites.

Live demo with steps to reproduce

• https://jsfiddle.net/highcharts/woxucvfk/
• As of 2022-06-12: https://www.highcharts.com/demo/line-basic

Product version

10.1.0

Affected browser(s)

All