Add label extensions

[codemunkie15]

Are you requesting that a Home Assistant template extension be added? Which one?
Extensions for labels

Is your feature request related to a problem? Please describe.
I'm trying to define CSS styles based on a label being attached to an entity.

Describe the solution you'd like
'Presence activated light' in label_entities(config.entity)

Describe alternatives you've considered
I can do this (requires label_id):
'presence_activated' in hass.entities[config.entity].labels

But would prefer to do this (uses label name instead):
'Presence activated light' in label_entities(config.entity)

Many thanks

[Nerwyn]

For my reference: https://www.home-assistant.io/docs/configuration/templating/#labels

I should work on the next minor version of this package once I'm done with v4 of my remote card.

[Nerwyn]

@codemunkie15 which frontend project do you want to test the new functions on? I've added a bunch of new functions to include in 1.3.0 and should be able to release a beta build of ha-nunjucks and a matching beta build on universal remote card or custom card features in a day or two. I forgot you posted a different issue to custom features, I'll make an alpha build there.

[Nerwyn]

Bad news - it turns out the hass object field I was using for a lot of labels logic _labelRegistry doesn't appear consistently and can't be used. I'm going to have to remove the label_id and label_name functions and limit label functions to just using the label ID, as the label name doesn't seem to be available otherwise.

[Nerwyn]

@codemunkie15 have you gotten around to trying this in the custom features project alpha?