[FEATURE] Introduce TCA > ctrl > descriptionColumn

Introduce annotation for table column fields "descriptionColumn". Is
added in TCA > ctrl for tables. Optional setting. Defined table column
that holds description / guidance for editors and admins within backend.

Description should only displayed in the backend.

Adds descriptionColumn to records that already hold internal description.
This patch does not add new description table columns.

Resolves: #67603
Related: #67550
Related: #67578
Releases: master
Change-Id: Ib081e5f14b9cbbcabbbad0d45a7a90274cd3dc09
Reviewed-on: http://review.typo3.org/40449


Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>