[FEATURE] Add TCA default sizes

Set the default size of the TCA fields date, int and float
to the value of 8.

Change-Id: I7ee052c8c9779547eb2928b763766c20fde0d304
Reviewed-on: http://review.typo3.org/32183
Reviewed-by: Tim Lochmüller <tim@fruit-lab.de>
Tested-by: Tim Lochmüller <tim@fruit-lab.de>