Merge branch '30-drop-support-for-s3dm' into 'master'

Resolve "Drop support for S3DM"

Closes #30

See merge request rsethc/slice!15
2 jobs for 33-support-separate-specular-ambient-diffuse-textures in 6 minutes and 20 seconds (queued for 2 seconds)
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build-slice-builder-ubuntu

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passed #966712181
build-slice-builder-windows

00:01:22