Some time ago the all the wizards for the Plain C++ were coalesced into one wizard.

Since then the wizard asks first for the targets via a targetsetuppage and then
in the CMakeOpenProjectWizard asked for the kit again.

This patch clean thats up, by always using the TargetSetupPage for kit
selection and removing code from the CMakeOpenProjectWizard for kit selection.

It also adds more types of buildconfigurations

Offer: Debug, Release, ReleaseWithDebugInfo, MinSizeRelease with the
corresponding -DCMAKE_BUILD_TYPE parameters. That argument is saved
in the build configuration and used once for the first cmake run. (Subsequent
runs of cmake don't require passing that to cmake again.)

Also do not require running cmake on creating the buildconfiguraiton, instead
postpone that until the buildconfiguration is made active. With the current
cmake wizard, selecting multiple kits would show a dialog per buildconfiguration.

Change-Id: I3bb806113f4f529f8e291830647d2515a6c4df8a
Task-number: QTCREATORBUG-12219
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>