3.1 Update

[rosenhauer]

1. Fix unattached parts when exporting as 3MF.
2. Fix Shell with small wall heights
3. Add new DisplayMounts option
4. Updated several examples and added new DisplayMount Example

[rosenhauer]

Images of the sample file.

[rosenhauer]

Image of an actual project box.

[rosenhauer]

Willem, Can you do a new release. I started a draft but not sure on how you generated the archives.