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_gui/qt/window/project_wizzard/QtProjectWizzardContentExtensions.h

@@ -11,7 +11,7 @@ class QtProjectWizzardContentExtensions
 	Q_OBJECT
 
 public:
-	QtProjectWizzardContentExtensions(std::shared_ptr<ProjectSettings> settings, QtProjectWizzardWindow* window);
+	QtProjectWizzardContentExtensions(std::shared_ptr<SourceGroupSettings> settings, QtProjectWizzardWindow* window);
 
 	// QtProjectWizzardContent implementation
 	virtual void populate(QGridLayout* layout, int& row) override;
@@ -20,6 +20,8 @@ public:
 	virtual void save() override;
 
 private:
+	std::shared_ptr<SourceGroupSettings> m_settings;
+
 	QtDirectoryListBox* m_sourceList;
 };