Refactored OWLOntologyManagerProperties

The only used field was alread on OWLOntologyLoaderConfiguration.
Made the manager save the loading configuration (could possibly migrate
to the ontology itself).
OWLOntologyLoaderconfiguration needs to be serializable
Part of Guessed-at entity type declarations should be annotated as such
#148
Guessed-at entity type declarations should be annotated as such #148
Implement Retries when loading from URLs #66

Incidentally, refactor a few bits in OWLOntologyLoaderConfiguration,
move the recently introduced parameter enums to the parameters package.
finished implementing #66
Implements OWLOntologyID to use Optional #160
implement Matt's comment on #160