Update Project Settings page

- Add screenshots
- Document reading and writing settings
- Document manually editing project.godot
- Note that most settings are changed in different
classes at runtime

tutorials/inputs/input_examples.rst

@@ -149,6 +149,8 @@ avoid this, make sure to test the event type first:
         }
     }
 
+.. _doc_input_examples_input_map:
+
 InputMap
 --------