Cleanup 6.0.0

[predic8]

All the points below are for discussion:

[ ] Take out old API Management Interceptor, examples, ...
[ ] Unneeded interceptors
[ ] Reference XSD on membrane-api.io

<spring:beans xmlns:spring="http://www.springframework.org/schema/beans"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xmlns="http://membrane-soa.org/proxies/1/"
              xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
					    http://membrane-soa.org/proxies/1/ http://membrane-soa.org/schemas/proxies-1.xsd">

[ ] Rename proxies.xml into apis.xml
[ | Delete echo() from Exchange() - Is that method needed?

[predic8]

Java 21

[predic8]

Describe guaranteed semantics like:

• In response you can assume that there is a response
• In request you can assume that there is a request

[predic8]

CBRInterceptor / switch uses XPath: Take out or replace with Script Support so XPath, JSONPath, SPel is working

there is a for CBR, but it works also with so take out the Internal Proxies.