logic: added C/C++ project setup from Code::Blocks

* also changed xml elements in sourcegroup settings that specify the used language standard, so that one sourcegroup can maintain multiple language standards
* added migration and migrated sample projects

src/lib/settings/SourceGroupSettingsWithSourceExtensions.h

@@ -0,0 +1,34 @@
+#ifndef SOURCE_GROUP_SETTINGS_WITH_SOURCE_EXTENSIONS_H
+#define SOURCE_GROUP_SETTINGS_WITH_SOURCE_EXTENSIONS_H
+
+#include <memory>
+#include <string>
+#include <vector>
+
+class ConfigManager;
+class FilePath;
+class ProjectSettings;
+
+class SourceGroupSettingsWithSourceExtensions
+{
+public:
+	SourceGroupSettingsWithSourceExtensions();
+	virtual ~SourceGroupSettingsWithSourceExtensions() = default;
+	
+	bool equals(std::shared_ptr<SourceGroupSettingsWithSourceExtensions> other) const;
+
+	std::vector<std::wstring> getSourceExtensions() const;
+	void setSourceExtensions(const std::vector<std::wstring>& sourceExtensions);
+	
+protected:
+	void load(std::shared_ptr<const ConfigManager> config, const std::string& key);
+	void save(std::shared_ptr<ConfigManager> config, const std::string& key);
+
+private:
+	virtual const ProjectSettings* getProjectSettings() const = 0;
+	virtual std::vector<std::wstring> getDefaultSourceExtensions() const = 0;
+
+	std::vector<std::wstring> m_sourceExtensions;
+};
+
+#endif // SOURCE_GROUP_SETTINGS_WITH_SOURCE_EXTENSIONS_H