Update and rename GuideToUsingGui.md to UserGuide.md

UserSettings lagres. EPJ data oppdatert.

Update xsd files to v55.0.1 (#6)

* Update to .NET6, update xsd files to v55.0.1

Update version

Update readme for GUI (#5)

Update readme for GUI

Add level 2 for sender/receiver in MsgHead (#2)

Adresses #1

Contains breaking change. The following args are now required in the console app:
--org-herid2
--org-navn2

Initial commit