Tim van der Meij bc1eb49a77
Implement creation date only for markup annotations
The specification states that `CreationDate` is only available for
markup annotations instead of for all annotation types.

Moreover, popup annotations are not markup annotations according to the
specification, so the creation date inheritance from the parent
annotation is also removed there (note that only the modification date
is used in e.g., the viewer).
2019-05-25 15:31:06 +02:00
..
2019-04-07 13:14:03 +02:00
2018-08-05 21:21:46 +02:00
2017-02-27 08:32:39 -06:00