Tidy up equals/hashcode in HashOrderedSetBackedSortedSet
Remove IgnoreInjectee annotation, unnecessary complication
Remove Injectable annotation, unnecessary complication
Remove InjectOutOf annotation, unnecessary complication (issue raised in GitHub as a reminder that this may be of use later)
Remove InjectCollections annotation, unnecessary complication
Rename IgnoreInjectable to IgnoreMockForCollections and add suitable integration test