ui: Rewrote project setup to wizzard

* QtProjectWizzard handles window managment logic of project setup
* QtProjectWizzardWindow is used in every step and displays QtProjectWizzardContent
* QtProjectWizzardContent is the base class for all differnt content types
* Removed Singleton from ProjectSettings
* ProjectSettings are created by wizzard and QtProjectWizzardContent can access and load
* added project type selection at start of wizzard
* added summary at end of wizzard
* show global search paths in setup and summary
* fixed layout problems after font switch
* fixed scrolling and resizing of QtDirectoryListBox
* separated QtLocationPicker to own class

src/lib_gui/qt/window/QtWindowStack.h

@@ -0,0 +1,32 @@
+#ifndef QT_WINDOW_STACK
+#define QT_WINDOW_STACK
+
+#include <vector>
+
+#include <QWidget>
+
+class QtWindowStack
+	: public QObject
+{
+	Q_OBJECT
+
+signals:
+	void empty();
+	void pop();
+	void push();
+
+public:
+	QtWindowStack(QObject* parent = nullptr);
+
+	QWidget* getTopWindow();
+
+public slots:
+	void pushWindow(QWidget* window);
+	void popWindow();
+	void clearWindows();
+
+private:
+	std::vector<QWidget*> m_stack;
+};
+
+#endif // QT_WINDOW_STACK