[TYPO3-50-general] [!!!] Change to defining the public API

[Karsten Dambekalns]

Hi.

I upgraded DocTools to use the trunk version of PHP_UML and it uses @api
also on class level.

That means that a class/interface *must* be annotated with @api to be
included in rendered API documentation. I fixed that for all classes
that already had @api annotations on methods and a bunch of other
classes (mostly exceptions) that did not.

I adjusted the CGL accordingly, as well.

Regards,
Karsten