More flexible rendering / text format

Looks like a good catch to me.

Reviewed the MR !6, worked well for me.

@kecsot @manoj-rajr @rckstr_rohan @rowrowrowrow

Thank you for your contribution and sorry for my super-late response. I posted my comment fo the coding standards, however I prefer Solution 2 if we want to customize the format since the proposed patch introduces somewhat additional layers such as 'Twig' and 'module'.

I understand that we need .module to use hook_theme(), on the other hand the design concept of this module is to provide as a block plugin, which should be simple as much as possible. Therefore, this module for a copyright block doesn't have .module file purposefully. Also, in modern UI era such as SPA, I assume that the role of Twig will be getting less and less.