[FEATURE] Improve the integration of links

Add option to choose how links are displayed in tweet. You can choose
between a short form or the whole link. Additionally the generation of
links is moved within the internal tweet handling.

Change-Id: I60bb7c997ec72404d7f9f64cb7054e96ce8f641e
Reviewed-on: https://review.typo3.org/26739
Reviewed-by: Nicole Cordes
Tested-by: Nicole Cordes