Fix.
Register views.
Introduce definitions view + defnition reference.
Improved citation styles.
Bugfix in Citation.
Added properties to Citation and updated CitationView.

- citation urls
- citation type
- comment
Changed contributor view to show the role in the header.
Added definition.
Support annotated titles in Cover.
Prettier date in Cover when only 2 date components are given.
Table can contain images now.
HW: support for inline images.
HW: tweaks in PublicationInfo.