Move sub-namespace typedefs to typedefs.js

Here too there is one problem case.

src/ol/layer/layerbase.js

@@ -22,20 +22,6 @@ ol.layer.LayerProperty = {
 };
 
 
-/**
- * @typedef {{layer: ol.layer.Layer,
- *            opacity: number,
- *            sourceState: ol.source.State,
- *            visible: boolean,
- *            managed: boolean,
- *            extent: (ol.Extent|undefined),
- *            zIndex: number,
- *            maxResolution: number,
- *            minResolution: number}}
- */
-ol.layer.LayerState;
-
-
 /**
  * @classdesc
  * Abstract base class; normally only used for creating subclasses and not