"rhauser submitted webis_server with tag master for tdaq-99-00-00"

=== webis_server ===

Add new C++ webproxy binary (Reiner Hauser) Move OH POST operation to separate thread (Reiner Hauser) Fix requests -> request variable name (Reiner Hauser) Added standard gitlab CI (Reiner Hauser) Add JSON errors to OH (Reiner Hauser) Implement JSON error replies for main server and IS (Reiner Hauser)