logic: source groups for project settings

* project can not have multiple source groups with different types
* language of a project is now inferred from source groups
* setting global NameHierarchy delimiter of first sourceGroup in project
* added project settings migrations for source groups
* Add Settings Migration classes (MoveKey, DeleteKey, Lambda)
* Update sample projects with migrations
* added method to config to retrieve sublevel key names
* implemented recursive removing of keys in settings
* moved project files out of top level
* removed solution parsing code as it is not used anymore

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src/lib/project/SourceGroupFactory.h

@@ -0,0 +1,30 @@
+#ifndef SOURCE_GROUP_FACTORY_H
+#define SOURCE_GROUP_FACTORY_H
+
+#include <memory>
+#include <vector>
+
+#include "settings/SourceGroupType.h"
+
+class SourceGroup;
+class SourceGroupSettings;
+class SourceGroupFactoryModule;
+
+class SourceGroupFactory
+{
+public:
+	static std::shared_ptr<SourceGroupFactory> getInstance();
+
+	void addModule(std::shared_ptr<SourceGroupFactoryModule> module);
+
+	std::vector<std::shared_ptr<SourceGroup>> createSourceGroups(std::vector<std::shared_ptr<SourceGroupSettings>> allSourceGroupSettings);
+	std::shared_ptr<SourceGroup> createSourceGroup(std::shared_ptr<SourceGroupSettings> settings);
+
+private:
+	static std::shared_ptr<SourceGroupFactory> s_instance;
+	SourceGroupFactory();
+
+	std::vector<std::shared_ptr<SourceGroupFactoryModule>> m_modules;
+};
+
+#endif // SOURCE_GROUP_FACTORY_H