Change ProjectSettings to Singleton interface

Signed-off-by: nggieber <52797929+AMZN-nggieber@users.noreply.github.com>

Code/Tools/ProjectManager/project_manager_files.cmake

@@ -58,8 +58,6 @@ set(FILES
     Source/CreateProjectCtrl.cpp
     Source/UpdateProjectCtrl.h
     Source/UpdateProjectCtrl.cpp
-    Source/ProjectManagerSettings.h
-    Source/ProjectManagerSettings.cpp
     Source/ProjectsScreen.h
     Source/ProjectsScreen.cpp
     Source/ProjectSettingsScreen.h
@@ -72,6 +70,9 @@ set(FILES
     Source/ProjectButtonWidget.cpp
     Source/ScreenHeaderWidget.h
     Source/ScreenHeaderWidget.cpp
+    Source/Settings.h
+    Source/Settings.cpp
+    Source/SettingsInterface.h
     Source/LinkWidget.h
     Source/LinkWidget.cpp
     Source/TagWidget.h