Fixed Docker Container

The docker container is now built for the linux/amd64 platform so that it runs on other platforms than a macOS.

Bugfix and Maintainance Release

News:

• All Factur-X/ZUGFeRD conformance levels are supported.
• Possibility to create arbitrary UBL and CII formats by overriding customization and profile id.
• Fixed a couple of bugs.

First Stable Release

The application can now create all relevant output formats. It can also be run inside of a container.