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/rotationconstraint.js

@@ -1,15 +1,8 @@
 goog.provide('ol.RotationConstraint');
-goog.provide('ol.RotationConstraintType');
 
 goog.require('ol.math');
 
 
-/**
- * @typedef {function((number|undefined), number): (number|undefined)}
- */
-ol.RotationConstraintType;
-
-
 /**
  * @param {number|undefined} rotation Rotation.
  * @param {number} delta Delta.