Release 6.0.0

[SteveDunn]

This contains a small breaking change to the namespaces used when generating Swashbuckle mapping and System.Text.Json converter factories.

You might have to change the names of STJ factories and Swashbuckle mappers. This is as a result of this bug:

• Fix: System.Text.Json factories fail to generate if assembly name has hyphens by @SteveDunn in Fix: System.Text.Json factories fail to generate if assembly name has hyphens #718

Please see the comment on the PR for #717 here: https://github.com/SteveDunn/Vogen/pull/718/files#r1865263127

Previously, if the project named contained dots, then these would be stripped out, but now they're replaced with _. The bug was that namespaces derived the project name failed when the project name contained hyphens.
Now, all characters that are legal in a project name but illegal in a namespace, are replaced with _

The other option is to use the global namespace for these, and suffix the name with the project, e.g. WebApplication_Shared.VogenTypesFactory becomes VogenTypesFactoryForWebApplication_Shared