fixed references to MediaPortal assemblies in MediaItemAspectModelBuilder
fixed #4292: Remove OFDB field from movie aspect
fixed #4297: Change cardinality for AspectAttribute 'Director' to ManyToMany
fixed #4296: Add 'Writers' to VideoAspect
Clear SeriesInfo collection properties before adding values from TheTvDb
Merge branch 'REWORK_Aspects' into _custom_
Fixed saving of DOKAN drive letter on first run; Fixed minor typo