Merge flags_country_scalable functionality into flags_country

Boris Doesborgrequested to merge
issue/flags-3138738:flags-3138738 into 8.x-1.x
  • Add CountryFlagScalableFormatter with multiple image formats (JPG, PNG, WebP, SVG, emoji)
  • Add configurable image heights (20-240px)
  • Add output format options (flag before/after/replace country name)
  • Add templates: flag-scalable, flag-webp, flag-emoji
  • Add CSS library for scalable styles
  • Update README with scalable formatter documentation
  • Fix coding standards issues in existing files

This consolidates the flags_country_scalable submodule into flags_country, making it easier to maintain and reducing module complexity.

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Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

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