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Use SVG `symbol` for icon system

Merged Administrator requested to merge tg-icons into master

Created by: tysongach

By using the SVG symbol element along with use, we gain:

  • Not having to run images through the generator.
  • Not having to manage a list of each image to precompile in engine.rb.
  • Not having to maintain a custom application helper.
  • The ability to add title and desc elements to each SVG when we call on an icon, which allows us to contextually add accessible names and descriptions.

Ref: https://css-tricks.com/svg-symbol-good-choice-icons/

There should be no visual changes.