HSTTWO-3282 add extra parameter WebAppType to indicate which kind of webapp the servlet context belongs to

- introducing a new hippo-repository-jaxrs module, providing a RepositoryJaxrsService infrastructure with a related RepositoryJaxrsServlet
- repository modules (and services) can now dynamically add/remove RepositoryJaxrsEndpoints to be exposed through the RepositoryJaxrsServlet
- invoking these RepositoryJaxrsEndpoints requires (repository based) authentication, optionally further auhorization secured through a new "restuser" role and "hippo:rest" permission on a configurable node using a hippo security domain

CMS7-8219 new api: a webresource bundle is the entry point for getting hold of all resources for a channel, and also the entry point for versioning (tagging)

CMS7-8204 add JAX-RS whiteboard service; applications can register their rest end-points with this marker interface and get automatically exposed over http

- move and rename services-api under tmp1/trunk and rename it back to services-api/trunk hereafter