Add hide label option

[reformatco]

Allows you to then use the label to generate a class in a template

[nickforddev]

@madebyreformat can you provide some more information in this PR about what it accomplishes? Screenshots welcomed.

Also ideally all new features are also added for 4.x version too.

Thanks

[reformatco]

It allows you to toggle showing the label in the admin panel, this is so you can use the label within a theme to specify a class generally as a variable.

I looked at adding a third element to the options array but im not sure its possible after a quick scan of the ACF workings, looks like it's only expecting two items after splitting on the colon

eg. can't add
#ff0000 : class-red : Red

I really like the plugin but don't want to add inline styles within the markup so wanted to toggle classes instead.

I tweaked the CSS for the swatch-toggle if it is selected just to make it a bit bigger too, see below: