Release branch for 6.0.1

[jthrilly]

Network Canvas Server 6.0.1

This is a small release containing bugfixes for several issues that have been identified since the launch of the stable version.

Changelog:

• Fix a crash on startup caused by the Bonjour service being stopped or unavailable
• Add automatic installation of Bonjour during installation
• Add Snap package support for Linux, as well as AppImage and deb package releases
• Fixed an issue where data exported from protocols without ego specific stages could contain empty GraphML elements
• Fixed numerous console warnings and errors