add own assertion makros

for now just mirroring Qt's ones
reverted shadowed Response detail accessors in INetwork

only returning pointer to Response
adding MockResponse

forgot it previously
made INetwork pointer in Manager as shared_ptr
adding netio::OAuthToken

for now only with `token`, `id` and `url` as properties
refactored scopes into OAuthToken

* removed Scopes class (made them simple QStringList)
  - might change that later again