Hide header option

Hi thanks for the contribution. I believe @seanb was keen to avoid adding many more plugins here to the core functionality and possible use viewsreference_extras instead, but will check since we have 'Hide header', this would match and maybe sensible.

However per 🐛 EntityUntranslatableFieldsConstraint can cause translation issues when content is created with an earlier version of viewsreference Needs work adding plugins may need update hook as well as its caused a comparison regression in multilingual it seems (though I have not looked very deeply into it yet).