Move top-level typedefs to typedefs.js

With one exception, those directly in the `ol` namespace can be moved without problem.
Some left-over goog.requires are also removed.

src/ol/source/imagearcgisrestsource.js

@@ -4,7 +4,6 @@ goog.require('goog.asserts');
 goog.require('goog.uri.utils');
 goog.require('ol');
 goog.require('ol.Image');
-goog.require('ol.ImageLoadFunctionType');
 goog.require('ol.events');
 goog.require('ol.events.EventType');
 goog.require('ol.extent');

src/ol/source/imagecanvassource.js

@@ -1,6 +1,5 @@
 goog.provide('ol.source.ImageCanvas');
 
-goog.require('ol.CanvasFunctionType');
 goog.require('ol.ImageCanvas');
 goog.require('ol.extent');
 goog.require('ol.source.Image');

src/ol/source/imagemapguidesource.js

@@ -4,7 +4,6 @@ goog.require('ol.events');
 goog.require('ol.events.EventType');
 goog.require('goog.uri.utils');
 goog.require('ol.Image');
-goog.require('ol.ImageLoadFunctionType');
 goog.require('ol.extent');
 goog.require('ol.object');
 goog.require('ol.source.Image');

src/ol/source/imagestaticsource.js

@@ -3,7 +3,6 @@ goog.provide('ol.source.ImageStatic');
 goog.require('ol.events');
 goog.require('ol.events.EventType');
 goog.require('ol.Image');
-goog.require('ol.ImageLoadFunctionType');
 goog.require('ol.ImageState');
 goog.require('ol.dom');
 goog.require('ol.extent');

src/ol/source/tileimagesource.js

@@ -3,7 +3,6 @@ goog.provide('ol.source.TileImage');
 goog.require('goog.asserts');
 goog.require('ol.ImageTile');
 goog.require('ol.TileCache');
-goog.require('ol.TileLoadFunctionType');
 goog.require('ol.TileState');
 goog.require('ol.events');
 goog.require('ol.events.EventType');

src/ol/source/vectortilesource.js

@@ -1,6 +1,5 @@
 goog.provide('ol.source.VectorTile');
 
-goog.require('ol.TileLoadFunctionType');
 goog.require('ol.TileState');
 goog.require('ol.VectorTile');
 goog.require('ol.events');