Merge 1.1.0 changes back to master.
Conflicts:
* extensions/guacamole-auth-cas/src/main/resources/guac-manifest.json
* extensions/guacamole-auth-duo/src/main/resources/guac-manifest.json
* extensions/guacamole-auth-openid/src/main/resources/guac-manifest.json
* extensions/guacamole-auth-quickconnect/src/main/resources/guac-manifest.json
* extensions/guacamole-auth-radius/src/main/resources/guac-manifest.json
* extensions/guacamole-auth-totp/src/main/resources/guac-manifest.json
* guacamole/src/main/webapp/translations/de.json