add support for importing need data from different sources

create won-utils module and won-utils-import sub-module
create interfaces to read need data from different sources
create not-implemented reader to read from smart engine data source
create writer to write needs as rdf each need in separate file into a folder
create dummy NeedDataReader implementations to provide an implementation example
create test to check correct writing of read Models into a temporary folder
rename the NeedDataReader (future) implementation
Merge branch 'feat-export-data' into devel