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/tilequeue.js

@@ -1,4 +1,3 @@
-goog.provide('ol.TilePriorityFunction');
 goog.provide('ol.TileQueue');
 
 goog.require('goog.asserts');
@@ -8,12 +7,6 @@ goog.require('ol.TileState');
 goog.require('ol.structs.PriorityQueue');
 
 
-/**
- * @typedef {function(ol.Tile, string, ol.Coordinate, number): number}
- */
-ol.TilePriorityFunction;
-
-
 /**
  * @constructor
  * @extends {ol.structs.PriorityQueue.<Array>}