[FEATURE] TypeConverter Loader

Add the Loader for the TypeConverter structure.
Also add a new example extension for the new Loader

Resolves: #61057
Change-Id: I1fcab632c64d5056351b9b83c49603d6afce931e
Reviewed-on: http://review.typo3.org/32248
Reviewed-by: Tim Lochmüller <tim@fruit-lab.de>
Tested-by: Tim Lochmüller <tim@fruit-lab.de>