QbsProjectManager: Introduce QbsKitInformation

... and use it to allow users to set custom properties in the
corresponding profile. This replaces the idiosyncratic and more
complicated approach we had before, when that was done in the qbs
profiles settings page. The profiles view is now read-only.

Change-Id: I0c29c1ac0c510e17d685e7bbaa38b54c8100ddb8
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp

@@ -31,6 +31,7 @@
 #include "qbsdeployconfigurationfactory.h"
 #include "qbsinfopage.h"
 #include "qbsinstallstep.h"
+#include "qbskitinformation.h"
 #include "qbsnodes.h"
 #include "qbsprofilessettingspage.h"
 #include "qbsproject.h"
@@ -93,6 +94,7 @@ bool QbsProjectManagerPlugin::initialize(const QStringList &arguments, QString *
     Core::FileIconProvider::registerIconOverlayForSuffix(ProjectExplorer::Constants::FILEOVERLAY_QT, "qbs");
 
     ProjectManager::registerProjectType<QbsProject>(QmlJSTools::Constants::QBS_MIMETYPE);
+    KitManager::registerKitInformation(new QbsKitInformation);
 
     //create and register objects
     addAutoReleasedObject(new QbsManager);