Move OBaseRecord to Types folder.
Test set collection deserialization with single ORID in it.
When ODocument is being parsed to some object, check if its type isn't ODocument, OVertex or OEdge and copy fields.
Refactor OEdge to use ODocument fields.
Refactor OVertex to use ODocument fields.
When deserializing ORID value it can belong to OVertex in_/out_ fields in which case it should be HashSet<ORID> instead of ORID.
Make class for graph classes tests.