Add icns-millefeuille.sh

The Agua system icons I'm using don't include all of the variants
required on Mac OS X 10.12 Sierra. The originals have seven sizes (32,
256, 512, and 1024), while the system icons have 10 (16, 32, 64, 128,
256, 512, 1024).

Using the seven-size icns didn't work when the file was copied into
`CoreTypes.bundle`. When I added additional icns size variants, the
replacement did work.

This script abstracts the manual work I did to add the appropriate
variants to the Agua icons. Other icon sets may not convert in the same
way.

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