Tweak 3D settings in various demos

- Use 4× MSAA for a better visual appearance.
- Use "3D Without Effects" framebuffer allocation when possible
  for better performance.
- Disable Glow in the 3D Kinematic Character demo for better
  performance. Increase the DirectionalLight strength to compensate.
- Use a non-linear attenuation for the OmniLight in the
  Window Management demo (and increase its range to compensate).

misc/window_management/project.godot

@@ -72,3 +72,8 @@ move_right={
 , Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777233,"unicode":0,"echo":false,"script":null)
  ]
 }
+
+[rendering]
+
+quality/intended_usage/framebuffer_allocation=3
+quality/filters/msaa=2