Make processing of X-Forwarded HTTP Headers configurable

[dstenger]

For security reasons usage of X-Forwarded HTTP Headers should be made configurable.

The processing of headers should be disabled by default.

This applies to deegree webservices and deegree ogcapi.

[dstenger]

Reference how spring developers deal with that topic: https://docs.spring.io/spring-boot/how-to/webserver.html#howto.webserver.use-behind-a-proxy-server