Series Label module add useHTML option

[pawellysy]

Description of the feature

The Series-Label module does not support enabling the useHTML option. It is a low-hanging fruit to implement.

Library related to the feature

all

Proof of Concept/Live example for the feature

example workaround: https://jsfiddle.net/BlackLabel/6dxoygp5/1/

Internal Note
when the label is created here:

highcharts/ts/Extensions/SeriesLabel.ts

Line 907 in 39e6022

.label(labelText, 0, 0, 'connector')

add labelOptions.useHTML as a 7 argument.

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[MarkusBarstad]

I will take this if no objections! :)

Hope its okay if i self-assign right away, just tell me if you want me to ask before hand and/or save a task for somebody else ;)