ui: basic CodeView with syntax highlighting

Added CodeView interface and QtCodeView implementation for showing syntax highlighted code snippets. This change avoids
using the GuiElement hierarchy by using directly using QtClasses and creating QtCodeView in the QtElementFactory.

src/app/main.cpp

@@ -1,20 +1,15 @@
 #include <memory>
 
 #include <QApplication>
-#include <QTextEdit>
-#include <qlayout.h>
-#include <qgroupbox.h>
 
 #include "Application.h"
 #include "includes.h"
-#include "qt/element/QtArea.h"
-#include "qt/element/QtCanvas.h"
 #include "qt/QtElementFactory.h"
 #include "qt/QtWindow.h"
 
-int main(int argv, char **args)
+int main(int argc, char *argv[])
 {
-	QApplication qtApp(argv, args);
+	QApplication qtApp(argc, argv);
 	std::shared_ptr<GuiElementFactory> elementFactory = std::make_shared<QtElementFactory>();
 
 	std::shared_ptr<QtWindow> window = std::make_shared<QtWindow>();
@@ -23,4 +18,4 @@ int main(int argv, char **args)
 	app->loadProject();
 
 	return qtApp.exec();
-}
+}