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.cpp

@@ -0,0 +1,64 @@
+#include "qt/window/QtWindowStack.h"
+
+QtWindowStack::QtWindowStack(QObject* parent)
+	: QObject(parent)
+{
+}
+
+QWidget* QtWindowStack::getTopWindow()
+{
+	if (m_stack.size())
+	{
+		return m_stack.back();
+	}
+
+	return nullptr;
+}
+
+void QtWindowStack::pushWindow(QWidget* window)
+{
+	if (m_stack.size())
+	{
+		m_stack.back()->hide();
+	}
+
+	window->show();
+
+	m_stack.push_back(window);
+
+	emit push();
+}
+
+void QtWindowStack::popWindow()
+{
+	if (m_stack.size())
+	{
+		m_stack.back()->hide();
+		delete m_stack.back();
+		m_stack.pop_back();
+
+		emit pop();
+	}
+
+	if (m_stack.size())
+	{
+		m_stack.back()->show();
+	}
+	else
+	{
+		emit empty();
+	}
+}
+
+void QtWindowStack::clearWindows()
+{
+	for (QWidget* window : m_stack)
+	{
+		window->hide();
+		delete window;
+	}
+
+	m_stack.clear();
+
+	emit empty();
+}