[TYPO3-core] RFC #6872: Add suggest-like feature to TCEforms

[Rupert Germann]

FYI: committed attached v13 to trunk

changes to v12:
- fixed styling of the search input
- fixed "minimumCharacters" which didn't work work


Big THANKS goes to Andreas Wolf for the initiative and for his patience 
  ;-) and of course also to all testers and contributers.

(improved) Documentation has been uploaded to:
http://wiki.typo3.org/index.php/Pending_Documentation#doc_core_api
http://wiki.typo3.org/index.php/Pending_Documentation#doc_core_tsconfig


greets
Rupert