Read symbolic and hicolor from same file

Merged Julian Sparber requested to merge jsparber/icon-tool:one_file into master

Missing parts are:

  • listen to file changes
  • read SVG with librsvg only once
  • unbreak symbolic icon view
  • unbreak old hicolor view (currently it needs the #hicolor id on a 128x128 square)
Edited by Julian Sparber

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