v1.6.0-dev.4

EMStudio 1.6.0-dev.4 — desktop builds.

Python sidecar frozen against s3dgraphy==1.6.0.dev15 (published on PyPI; that is what makes this build reproducible).

macOS: unsigned builds need one right-click ▸ Open, or
xattr -dr com.apple.quarantine /Applications/EMStudio.app.