provide bundled change sources as plugins

* this should help to "unify" the way changes sources are defined
provide bundled schedulers as plugins
provide bundled build slaves as plugins
be explicit about wildcard import

* this allows to inject them into configuration file and access necessary bits
  in a bit shorter way
provide bundled steps as plugins
provide bundled status receivers as plugins
introduce 'util' category of plugins

* this will help to make master.cfg files that only use core functinality to
  look much simpler
update sample for master.cfg to use plugins
update user manual

* Work In Progress
update developer documentation

* Work In Progress
update release notes