fix doc target. this does still not solve the problem that qdoc has to be build in release mode if you use windows.

Details:  Now it even works for qtc's source.

Details:  That is we update all generated headers (which are new or
modfied) in the C++ Engine. Big if, this only works if we find the
correct path for the ui header files. Which is known to sometimes not
work, I'll fix that next.

Task:     Reported on #qt
RevBy:    dt
Details:
This code was only intended for X11, hence we
ifdef it for now. Obviously windows users might
want to use windows style.

RevBy: Discussed with Thorbjorn

Fixes: Documentation - some extra content and adding the Code Editor page as a placeholder for future content

Details:  - Naming convention

Details:  - Preparation for ICommand rename

Details:  - Conform to naming convention

Details:  - Preparation for IActionContainer --> ActionContainer

Task:     Found on irc by ferret_svk
Details:  Even if CONFIG is debug_and_release we are interested wheter
          debug or release is the default.

The _ is usually used to prefix internal and/or private methods and
members. Having those turn up at the top of the list of suggestions for
completion isn't too useful. Improves the autocompletion for example for
the STL.

Done together with Roberto Raggi.

Details:  - I'm still not too happy with the whole construction but anyway.
The ToolBarActionContainer was never really used anymore (e.g. you
couldn't create one)

RevBy: Thorbjorn

Makes Qt Creator read external editor string from .ini

Unfortunately, the "this file has been edited outside of Qt Creator" dialog pops up.

Details:
ActionManager::registerAction(qaction, id):
  use registerAction(qaction, id, QList<int>() << Core::C_GLOBAL_ID)
ActionManager::addAction/Menu:
  use ActionManager::actionContainer + IActionContainer::addAction/Menu