* Allow for a more controlled setup of buildconfigurations inside
   the targets.

Reviewed-by: dt

Reviewed-by: dt

This is a big change touching almost all of our .pro file parsing.
With this patch we only evaluate once exact for all needs and once
greedy for the filelist. That is the qt runconfigurations don't have own
evaluaters but reuse the project wide exact evaluation.

We reevaluate if the user changes the build directory, the qmake
buildconfiguration or the qmake arguments. That is if you open src.pro
(or projects.pro) of qt with a shadow build you still don't get all the
files, but after correcting the build directory, we reevaluate the .pro
files and find all files. So for a suitable definition of fixed, that
bug is now fixed.

We now get the exact defines of all .pro files instead of all defines for all
buildconfigurations. We still don't distinguish in which
.pro file a DEFINE is set. So the code model now knows about all the
defines set for the given configuration but not for which files it is
actually set. Also that includes all DEFINES set in .qmake.cache or the
mkspecs. This means all defines from .pro files should now work.

The intial loading is still synchronous. I haven't looked into it to
deeply, but it seems possible to make it also async.There are probably a
few issues which need to be solved fist.

Also due to the asynchronous nature of the code, the executable is
updated a few seconds after actually changing the build configuration

 * kh1 says there is no such thing as there is no technical
   destinction between Maemo devices and the Maemo emulator.

Reviewed-by: kh1

 * Fixes RunConfigurations not updating when changing something
   in the BuildConfiguration.

Reviewed-by: dt

 * Do not use the BuildManager but have the qmakestep trigger
   the update via the target and project.

Reviewed-by: dt

thus fixing the exit warning:
"~QX11PixmapData(): QPixmap objects must be destroyed..."

Acked-by: con

Use that for showing details about connected Symbian devices.
Also update the icon with an (not-)connected overlay icon.
Graphics design pending.

 * Ease cross device development by introducing 'targets' which
   group build- and runsettings that are valid for this one target

 Most of the kudos for the code review go to dt. Con, thorbjorn,
 ckandler and others did also review parts of this patch.

Reviewed-by: dt