[TYPO3-50-general] @api annotation for protected properties

[Sebastian KurfŸürst]

Hi,

while setting @api annotations for Extbase, I think I have found some 
missing @api annotations for FLOW3 as well:

Especially in the ActionController and in AbstractController (generally 
in all whitebox-extension points), things like $request, $response etc 
should IMO be marked with @api, as you can call them from inside, and 
they _are_ part of the public API and should be shown in the API doc.

Do you think the same? :-)

Greets,
Sebastian