Add OAUTH2 OIDC login support (#1140)

* Somewhat working

* Change Autocreate logic

* Add OAuth Error Message if Auto create Disabled

* Display OAUTH2 username(email) in Account Settings

* Disable Change user/pass for Oauth2 user

* Hide SSO Button if SSO login Disabled

* Remove some spaces and comments

* Add OAUTH2 Login example docker-compose file

* Add Some Comments

* Hide Printing of Client secret

* Remove OAUTH2 Beans

and replace with applicationProperties

* Add conditional annotation to Bean Creation

* Update settings.yml.template

Add OAUTH2 enabling template.

* Update messages_en_GB.properties

src/main/resources/settings.yml.template

@@ -7,6 +7,12 @@ security:
   csrfDisabled: true
   loginAttemptCount: 5 # lock user account after 5 tries
   loginResetTimeMinutes : 120 # lock account for 2 hours after x attempts
+  #oauth2:
+  #  enabled: false # set to 'true' to enable login (Note: enableLogin must also be 'true' for this to work)
+  #  issuer: "" # set to any provider that supports OpenID Connect Discovery (/.well-known/openid-configuration) end-point
+  #  clientId: "" # Client ID from your provider
+  #  clientSecret: "" # Client Secret from your provider
+  #  autoCreateUser: false # set to 'true' to allow auto-creation of non-existing users
 
 system:
   defaultLocale: 'en-US' # Set the default language (e.g. 'de-DE', 'fr-FR', etc)