TargetSetupPage: Generalize the page

Generalize the target setup page and move it into projectexplorer

Move the qmake specific code into a projectimporter class with
a specialization for qmake projects in the qt4projectmanager.

This change depends heavily on the BuildConfigurationFactory cleanups
done earlier and completes that change in such a way that generic
build configuration factories are now in theory possible. The
remaining problem is how to select the best factory of several that
claim to be able to handle a kit and that is left for the next patch.

Change-Id: I47134cb1938c52adebcdc1ddfe8dbf26abbbbeee
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.h

@@ -87,6 +87,9 @@ public:
 
     bool canCreate(const ProjectExplorer::Target *parent) const;
     QList<ProjectExplorer::BuildInfo *> availableBuilds(const ProjectExplorer::Target *parent) const;
+    bool canSetup(const ProjectExplorer::Kit *k, const QString &projectPath) const;
+    QList<ProjectExplorer::BuildInfo *> availableSetups(const ProjectExplorer::Kit *k,
+                                                        const QString &projectPath) const;
     ProjectExplorer::BuildConfiguration *create(ProjectExplorer::Target *parent,
                                                 const ProjectExplorer::BuildInfo *info) const;