Code drop

- XPLANBOX-3629 - fixed use of username/passowrd (3c76c56f8)
- XPLANBOX-3629 - added XPLanWerkWMS Capabilities 1.1.1, added dcp assertions (91109783b)
- XPLANBOX-3629 - reset links after removing xplan-gateway (360090323)
- XPLANBOX-3633 - Remove xplan-gateway SoapUI project (3df793260)
- XPLANBOX-3633 - Migrate xplan-gateway tests to xplan-webservices, adjust assertions and do refactorings (03d055b5c)
- XPLANBOX-3629 - replaced links to XPlanGateway with links to XPlanWMS/XPlanValidatorWMS (0e311fa79)
- XPLANBOX-3629 - removed xplan-gateway from test execution (0c01f9b75)
- XPLANBOX-3629 - removed xplan-gateway from gitlab build (5aeaeb581)
- XPLANBOX-3629 - removed module xplan-gateway (069c18ccf)
- XPLANBOX-3618 - check if port is not set (60829f3ed)

Co-authored-by: Dirk Stenger <stenger@lat-lon.de>
Co-authored-by: Lyn Elisa Goltz <goltz@lat-lon.de>

Dropped from commit: 9be43a650ec4f45a154ba62a3bca996c2bf93987