Dependency cleanup
Condensed dependencies as much as I can

* Removed almost all ONMS dependencies
* Splitted interface helper into generic and OCS specific one
* Build small utils classes
* Generate requisition transport format classes from XSD instead of
    importing them
* Reworked dependencies for plugins
Merge branch 'feature-depclean'
fixed test layout
Merge branch 'master' into develop after merging mistake