Details:  Add a dialog asking for command line options and build
directory. This dialog pops up if you don't have a .user file. Note,
though that it also pops up if there is already a in source build.
(The build directory lineedit should be read only then.)
The cmake button in that dialog and the output pane need more polish to
make them better. With those changes you can now build and run marble
from Qt Creator. (For marble you need to pass a few options to cmake.)

Also add a configuration page to the Tools/Options dialog, where you can
specify the cmake executable path.

And add a class which runs cmake in the background to find out which
version and wheter that cmake version has Qt Creator generator. (Which I
did begin to write.)

Details:  We don't act on that information yet.

Details:  There's a linedit on there, we restore and save the settings,
only thing missing is actually using it.

Many singletons have their own instance() method, in which case there is
no need to use ICore::instance() to get access to them.

replace ExtensionSystem::PluginManager::instance()->getObject<Core::ICore>() by Core::ICore::instance()

forward declaration is sufficient.

Dependencies between projects can now be edited in the Projects mode.
You can simply check for each project the projects that it depends on,
and they will be built first. A message box pops up when you try to
create a circular dependency.

Could use some testing.

Details:  I haven't checked, but according to the cmake sources I need to change this.

- avoid polution of the source.
- required for KDE apps.

Details:  Copy and paste error

Details:  One step at a time.

Task:     CMake support
Details:  we don't pass those to the cbp file generation, that might create problems.

Details:  Forgot to add the factories, also the configuration options for the cmakestep don't work atm.

Details:  Not yet usable, but at least you get a list of build targets now.

Details:  Not the most pressing problem, but easy to fix.

Task:     -
RevBy:    -
AutoTest: -
Details:  For now create only one build configuration "AllTargets",
build only the "all" target. Create runconfigurations for all targets
with option type=4

Task:     -
RevBy:    -
AutoTest: -
Details:  -

Task:     -
RevBy:    -
AutoTest: -
Details:  Note: I need to refactor the code significantly, i'm more or
less convinced that one build configuration per target is wrong.
We probably want one build configuration per build directory and instead
build all targets that we are interested then in the makestep.
This means we won't have any cmake support for the beta.

Task:     -
RevBy:    -
AutoTest: -
Details:  Add the include path for qplatformdefs.h to the fot.

Task:     -
RevBy:    -
AutoTest: -
Details:  (Only outputs them via qDebug().)

Task:     -
RevBy:    -
AutoTest: -
Details:  Actually building only works on unix (since the generator is
hardcoded.) and make is called without any parameters which is wrong.
A lot is missing for basic build support, but this is a start.

Task:     -
RevBy:    -
AutoTest: -
Details:  -

Details:  Also add copyright headers and some initial code for the
CMakeStep and MakeStep. Soon it will actially build something.