GitLab

The only view that is sane is my view. Adds handling of return/enter
for macintosh. Allows for overriding whether single or double click
activates items via setActivationMode.

Change-Id: Id8f9001f99162833c682dfc5b2b1abac04ce18a3
Reviewed-by: Eike Ziller <eike.ziller@digia.com>