* Adds "useTags" option to all jaxrs code generators (AbstractJAXRSServerCodegen):
- jaxrs-jersey
- jaxrs-spec
- jaxrs-cxf-cdi
- jaxrs-resteasy
- jaxrs-cxf
- jaxrs-cxf-extended
- java-msf4j
- jaxrs-resteasy-eap
* jaxrs-spec
- Changed handling of root paths: e.g "/:", "/{id}:" to simplify code and create a more consistent behaviour
-- old: use tag for classname
-- new: use tag only if useTags is enabled, use "DefaultApi" if not
* @path class level annotation
- for all generators above and the microprofile generator (uses same jaxrs postprocessing)
- extended the "commonPath" to contain more than only the root path if possible
- e.g. "/group1/subgroup1/op1" -> "/group1/subgroup1" is moved to class level annotation