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/SourceGroupSettingsCppEmpty.cpp

@@ -0,0 +1,49 @@
+#include "settings/SourceGroupSettingsCppEmpty.h"
+
+SourceGroupSettingsCppEmpty::SourceGroupSettingsCppEmpty(const std::string& id, const ProjectSettings* projectSettings)
+	: SourceGroupSettingsCxxEmpty(id, SOURCE_GROUP_CPP_EMPTY, projectSettings)
+{
+}
+
+void SourceGroupSettingsCppEmpty::load(std::shared_ptr<const ConfigManager> config)
+{
+	SourceGroupSettingsCxxEmpty::load(config);
+
+	const std::string key = s_keyPrefix + getId();
+
+	SourceGroupSettingsWithCppStandard::load(config, key);
+}
+
+void SourceGroupSettingsCppEmpty::save(std::shared_ptr<ConfigManager> config)
+{
+	SourceGroupSettingsCxxEmpty::save(config);
+
+	const std::string key = s_keyPrefix + getId();
+
+	SourceGroupSettingsWithCppStandard::save(config, key);
+}
+
+bool SourceGroupSettingsCppEmpty::equals(std::shared_ptr<SourceGroupSettings> other) const
+{
+	std::shared_ptr<SourceGroupSettingsCppEmpty> otherCxxEmpty = std::dynamic_pointer_cast<SourceGroupSettingsCppEmpty>(other);
+
+	return (
+		otherCxxEmpty &&
+		SourceGroupSettingsCxxEmpty::equals(other) &&
+		SourceGroupSettingsWithCppStandard::equals(otherCxxEmpty)
+	);
+}
+
+const ProjectSettings* SourceGroupSettingsCppEmpty::getProjectSettings() const
+{
+	return m_projectSettings;
+}
+
+std::vector<std::wstring> SourceGroupSettingsCppEmpty::getDefaultSourceExtensions() const
+{
+	return { 
+		L".cpp",
+		L".cxx",
+		L".cc"
+	};
+}