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/color/color.js

@@ -3,7 +3,6 @@
 // causes occasional loss of precision and rounding errors, especially in the
 // alpha channel.
 
-goog.provide('ol.Color');
 goog.provide('ol.color');
 
 goog.require('goog.asserts');
@@ -13,17 +12,6 @@ goog.require('ol');
 goog.require('ol.math');
 
 
-/**
- * A color represented as a short array [red, green, blue, alpha].
- * red, green, and blue should be integers in the range 0..255 inclusive.
- * alpha should be a float in the range 0..1 inclusive. If no alpha value is
- * given then `1` will be used.
- * @typedef {Array.<number>}
- * @api
- */
-ol.Color;
-
-
 /**
  * This RegExp matches # followed by 3 or 6 hex digits.
  * @const