Do not offer CMake-specific wizards if that plugin is not enabled.

Rationale:
    a) For people not interested in CMake, the wizards unnecessarily
clutter the UI. If unhandled, this problem would get worse the more
build systems we support.
    b) If such a wizard is actually used in the absence of the plugin,
nothing visible will happen after it has finished, which is guaranteed
to confuse users.

Change-Id: I070409d3185b11d2e04e33927a97843e60c657ff
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/cmakeprojectmanager/cmakeprojectplugin.cpp

@@ -37,6 +37,7 @@
 #include "cmakelocatorfilter.h"
 #include "cmakefilecompletionassist.h"
 
+#include <coreplugin/featureprovider.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/mimedatabase.h>
 #include <texteditor/texteditoractionhandler.h>
@@ -47,6 +48,16 @@
 
 using namespace CMakeProjectManager::Internal;
 
+class CMakeFeatureProvider : public Core::IFeatureProvider
+{
+    Core::FeatureSet availableFeatures(const QString & /* platform */) const {
+        return Core::FeatureSet(Core::Id(CMakeProjectManager::Constants::CMAKE_SUPPORT_FEATURE));
+    }
+
+    QStringList availablePlatforms() const { return QStringList(); }
+    QString displayNameForPlatform(const QString & /* platform */) const { return QString(); }
+};
+
 CMakeProjectPlugin::CMakeProjectPlugin()
 {
 }
@@ -70,6 +81,7 @@ bool CMakeProjectPlugin::initialize(const QStringList & /*arguments*/, QString *
     addAutoReleasedObject(new CMakeEditorFactory(manager));
     addAutoReleasedObject(new CMakeLocatorFilter);
     addAutoReleasedObject(new CMakeFileCompletionAssistProvider(cmp));
+    addAutoReleasedObject(new CMakeFeatureProvider);
     return true;
 }