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/compilationdatabaseprojectmanager/compilationdatabaseproject.cpp

@@ -8,8 +8,9 @@
 
 #include <coreplugin/coreplugintr.h>
 #include <coreplugin/icontext.h>
-#include <cppeditor/cppprojectupdater.h>
+
 #include <cppeditor/projectinfo.h>
+
 #include <projectexplorer/buildinfo.h>
 #include <projectexplorer/buildsteplist.h>
 #include <projectexplorer/buildtargetinfo.h>
@@ -21,8 +22,10 @@
 #include <projectexplorer/namedwidget.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/projectnodes.h>
+#include <projectexplorer/projectupdater.h>
 #include <projectexplorer/target.h>
 #include <projectexplorer/toolchainmanager.h>
+
 #include <texteditor/textdocument.h>
 
 #include <utils/algorithm.h>
@@ -43,7 +46,6 @@ namespace Internal {
 
 namespace {
 
-
 bool isGccCompiler(const QString &compilerName)
 {
     return compilerName.contains("gcc")
@@ -312,7 +314,7 @@ void createTree(std::unique_ptr<ProjectNode> &root,
 
 CompilationDatabaseBuildSystem::CompilationDatabaseBuildSystem(Target *target)
     : BuildSystem(target)
-    , m_cppCodeModelUpdater(std::make_unique<CppEditor::CppProjectUpdater>())
+    , m_cppCodeModelUpdater(ProjectUpdaterFactory::createCppProjectUpdater())
     , m_deployFileWatcher(new FileSystemWatcher(this))
 {
     connect(target->project(), &CompilationDatabaseProject::rootProjectDirectoryChanged,