Add Plasma SVG ToolBar

Noah Davisrequested to merge
work/ndavis/plasma-svg3 into master

Ultra simple, but still has issues:

  • PC3 uses separator from widgets/listitem. How would we nest a different SVG inside this? Arguably the line should have been implemented in widgets/toolbar instead, but we'll need to do that instead and maybe support fallback behavior for when the properly themed elements aren't available.
  • No support for position (header/footer)

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