Project Manager - Barebones UI Made for All Screens with Basic Flow (#507)

* Created all barebone screens, a screen factory, and connected basic transitions between screens

* Changed ProjectManager namespace to O3DE::ProjectManager, removed empty new lines, switch to aznumberic_cast usage

* Project Manager - Moved Qt directory into source

Code/Tools/ProjectManager/source/main.cpp

@@ -48,7 +48,7 @@ int main(int argc, char* argv[])
     AzQtComponents::StyleManager styleManager(&app);
     styleManager.initialize(&app, engineRootPath);
 
-    ProjectManager::ProjectManagerWindow window(nullptr, engineRootPath);
+    O3DE::ProjectManager::ProjectManagerWindow window(nullptr, engineRootPath);
     window.show();
 
     return app.exec();