Allow updating of configuration or file list separately

Now it will only update the list of files when you edit [project].files,
and only reparse all files when you edit [project].config or
[project].includes. When updating the file list it will only parse the
added files.

src/plugins/genericprojectmanager/genericproject.h

@@ -94,6 +94,14 @@ public:
     QString buildParser(const QString &buildConfiguration) const;
     ProjectExplorer::ToolChain *toolChain() const;
 
+    enum RefreshOptions {
+        Files         = 0x01,
+        Configuration = 0x02,
+        Everything    = Files | Configuration
+    };
+
+    void refresh(RefreshOptions options);
+
     QStringList includePaths() const;
     void setIncludePaths(const QStringList &includePaths);
 
@@ -106,18 +114,15 @@ public:
 
 public Q_SLOTS:
     void setToolChainId(const QString &toolChainId);
-    void refresh();
 
 protected:
     virtual void saveSettingsImpl(ProjectExplorer::PersistentSettingsWriter &writer);
     virtual void restoreSettingsImpl(ProjectExplorer::PersistentSettingsReader &reader);
 
 private:
-    void parseProject();
+    void parseProject(RefreshOptions options);
     QStringList convertToAbsoluteFiles(const QStringList &paths) const;
 
-    QStringList readLines(const QString &absoluteFileName) const;
-
     Manager *m_manager;
     QString m_fileName;
     QString m_filesFileName;