fuzzitdev / lib3mf

Update documentation

Add minimal functionality to Python-example

Merge pull request 3MFConsortium#117 from 3MFConsortium/release/1.8.1
This prepares the release of v1.8.1, which will be the first that follows gitflow.

Not officially released

Fix SDK-example: slices

NC-5062: Implement new versioning scheme
SONAME versioning, changed API, documentation and SDK-examples