oidc-agent desktop integration

 Desktop integration files for oidc-gen and oidc-agent and for creating the user
 dialog.
 .
 This package adds two ways for supporting the usage of oidc-agent in a
 graphical environment.
 The .desktop file to leverage browser integration to support the authorization
 code flow in oidc-gen.
 The Xsession file to consistently set the environment variables necessary to
 for client tools to connect to the oidc-agent daemon.
 .
 This package also provides a bash script as an interface to create different
 dialog windows. It uses yad to create windows.