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/interaction/dragpaninteraction.js

@@ -2,7 +2,7 @@ goog.provide('ol.interaction.DragPan');
 
 goog.require('goog.asserts');
 goog.require('ol.Kinetic');
-goog.require('ol.Pixel');
+
 goog.require('ol.ViewHint');
 goog.require('ol.coordinate');
 goog.require('ol.functions');

src/ol/interaction/modifyinteraction.js

@@ -11,7 +11,6 @@ goog.require('ol.CollectionEventType');
 goog.require('ol.Feature');
 goog.require('ol.MapBrowserEvent.EventType');
 goog.require('ol.MapBrowserPointerEvent');
-goog.require('ol.Pixel');
 goog.require('ol.ViewHint');
 goog.require('ol.array');
 goog.require('ol.coordinate');

src/ol/interaction/pointerinteraction.js

@@ -3,7 +3,6 @@ goog.provide('ol.interaction.Pointer');
 goog.require('ol');
 goog.require('ol.MapBrowserEvent.EventType');
 goog.require('ol.MapBrowserPointerEvent');
-goog.require('ol.Pixel');
 goog.require('ol.interaction.Interaction');
 goog.require('ol.object');
 

src/ol/interaction/snapinteraction.js

@@ -9,7 +9,6 @@ goog.require('ol.CollectionEventType');
 goog.require('ol.Feature');
 goog.require('ol.Object');
 goog.require('ol.Observable');
-goog.require('ol.Pixel');
 goog.require('ol.coordinate');
 goog.require('ol.events');
 goog.require('ol.events.EventType');