Feature: Link assets from contact (both in list view and in detailed view)

[KaiDol]

As a user I would like to link assets to a contact, both in list view (via dropdown option) and in detailed view with a dropdown similar to the once in memo.

[chrberndt]

We already had enabled the asset-tags for contacts, at least on the detail level but we have disabled this feature, since there is an unresolved issue with the synchronization with the card-dav categories.

According to the vCard standard, Categories may be grouped by type: https://tools.ietf.org/html/rfc6350#section-6.7.1 - which is a useful feature but can't be mapped to Liferay's AssetTags, since they are "only" tags (which do not support a concept of "types").

Therefore, we have decided to implement vCard compliant categories, which sync their contents to Liferay's asset-tags.

We could try to add ui-widgets similar to those of Liferay's AssetTags, but I assume, this is a bit costly task, since we can't rely on ready to use widgets by Liferay proper.

Nonetheless: a cool and useful feature.