Release v0.3.0

[kKdH]

Release

Main goal of v0.3.0 is persistence! Sub-systems should persist their state and restore it so they can continue to work after they have been restarted.

Checklist:

• [ ] Update RELEASES.adoc
• [ ] Update README.adoc
• [ ] Check documentation
• [ ] Check examples
• [ ] Create git-tag
• [ ] Publish artifacts
• [ ] Increment version