changed al json dependencies to the json in the central repository (version: 20090211)
remove POI dependency, is used in other branch
Now using json from central repository, needed for the XML support (json > xml).
Comments is not allowed in JSON, but we prefer to use comments in the components.json.
In ComponentRegistry the components.json is first minified (comments removed) and then parsed.
Users prefer to open the ServiceUsageMatrix in the same window.
Custom json jar not needed anymore