[LYN-2515] Project Manager Gem List Base (#603)

* [LYN-2515] Project Manager Gem List Base

* Added gem model based on a standard item model
* Added list view using the gem model
* Added item delegate for a gem according to the UX design
* Removed th gem catalog ui file and replaced it with code
* Moved the gem catalog files into a sub folder

Code/Tools/ProjectManager/Source/ScreenFactory.cpp

@@ -13,7 +13,7 @@
 
 #include <FirstTimeUse.h>
 #include <NewProjectSettings.h>
-#include <GemCatalog.h>
+#include <GemCatalog/GemCatalog.h>
 #include <ProjectsHome.h>
 #include <ProjectSettings.h>
 #include <EngineSettings.h>