ProjectExplorer: Promote CppProjectUpdaterInterface

... to ProjectExplorer::ProjectUpdaterInterface and generalize it
regarding language, but create a convience function for the C++
case, as that's the only user right now.

Also add the self-registering factory boilerplate and adapt all
buildsystems.

Change-Id: If928512609d41c25fad2aa58633c8bffabc4c48f
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/genericprojectmanager/genericproject.cpp

@@ -3,8 +3,6 @@
 
 #include "genericproject.h"
 
-#include "genericbuildconfiguration.h"
-#include "genericmakestep.h"
 #include "genericprojectconstants.h"
 #include "genericprojectmanagertr.h"
 
@@ -13,10 +11,6 @@
 #include <coreplugin/icore.h>
 #include <coreplugin/idocument.h>
 
-#include <cppeditor/cppprojectupdaterinterface.h>
-
-#include <extensionsystem/pluginmanager.h>
-
 #include <projectexplorer/abi.h>
 #include <projectexplorer/buildinfo.h>
 #include <projectexplorer/buildsteplist.h>
@@ -27,6 +21,8 @@
 #include <projectexplorer/kitaspects.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/projectnodes.h>
+#include <projectexplorer/projectupdater.h>
+
 #include <projectexplorer/selectablefilesmodel.h>
 #include <projectexplorer/target.h>
 #include <projectexplorer/taskhub.h>
@@ -156,7 +152,7 @@ private:
     QStringList m_cxxflags;
     QStringList m_cflags;
 
-    CppEditor::CppProjectUpdaterInterface *m_cppCodeModelUpdater = nullptr;
+    ProjectUpdater *m_cppCodeModelUpdater = nullptr;
 
     FileSystemWatcher m_deployFileWatcher;
 };
@@ -186,16 +182,7 @@ GenericProject::GenericProject(const Utils::FilePath &fileName)
 GenericBuildSystem::GenericBuildSystem(Target *target)
     : BuildSystem(target)
 {
-    QObject *projectUpdaterFactory = ExtensionSystem::PluginManager::getObjectByName(
-        "CppProjectUpdaterFactory");
-    if (projectUpdaterFactory) {
-        const bool successFullyCreatedProjectUpdater
-            = QMetaObject::invokeMethod(projectUpdaterFactory,
-                                        "create",
-                                        Q_RETURN_ARG(CppEditor::CppProjectUpdaterInterface *,
-                                                     m_cppCodeModelUpdater));
-        QTC_CHECK(successFullyCreatedProjectUpdater);
-    }
+    m_cppCodeModelUpdater = ProjectUpdaterFactory::createCppProjectUpdater();
 
     connect(target->project(), &Project::projectFileIsDirty, this, [this](const FilePath &p) {
         if (p.endsWith(".files"))