Fix - use custom authorization for endpoints

[JimBimBomBom]

right now the use of authorization is a bit confused -> use of app.UseAuthorization, and a custom middleware

• this could be unified into an injection of my middleware into .NET, so that calling app.UseAuthorization would suffice.
• this would also allow me to specify the need for authorization on a per endpoint basis (.RequireAuthorization() instead of useWhen())

[JimBimBomBom]

Solved in #145