[FEATURE] Map custom Domain model with a default text

Map custom extbase models with a default database value (int)
and a default TCA configuration, that explain the next steps.

Resolves: #61928
Change-Id: I33ffa83217e1abdd7c2b2edd01273f6a0904a1b6
Reviewed-on: http://review.typo3.org/33221
Reviewed-by: Tim Lochmüller <tim@fruit-lab.de>
Tested-by: Tim Lochmüller <tim@fruit-lab.de>