[icons] deprecated icon bug with sketch plugin

[laurenmrice]

Deprecated icons

• The plugin is not deleting/removing the deprecated icon artwork/artboards out of the sketch library.

  Deprecated:

  • mammogram--stacked.svg
  • logo--delicious.svg
  • logo--stumbleupon.svg
  • logo--google.svg

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• Some icons were renamed to a new name but are still showing up in the library under their old names as well as their new names (which causes them to appear twice in different places in the library). These 4 icons were listed as removed in a pr, but they might have just been renamed? Related: #5015

  Duplicate icons:

  • cloud--lightning should be thunderstorm
  • cloud--rain should be rain
  • cloud--snow should be snow
  • sunny should be sun

Giph example:

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• There are duplicates of the checkbox icon variations. Should only have indeterminate sets and not undeterminate.
  Related: #4195

  Keep:

  • checkbox--indeterminate
  • checkbox--indeterminate--filled

  Don't keep:

  • checkbox--undeterminate
  • checkbox--undeterminate--filled