Get rid of stability annotations and document stability with api

This change adds a stability value to the api annotation, with
'experimental' as default value.

enum, typedef and event annotations are never exportable, but
api annotations are needed there to make them appear in the
docs.

Nested typedefs are no longer inlined recursively, because the
resulting tables get too wide with the current template.

src/ol/layer/vectorlayer.js

@@ -21,7 +21,6 @@ ol.layer.VectorProperty = {
  * @extends {ol.layer.Layer}
  * @fires {@link ol.render.Event} ol.render.Event
  * @param {olx.layer.VectorOptions=} opt_options Options.
- * @todo stability experimental
  * @todo api
  */
 ol.layer.Vector = function(opt_options) {
@@ -71,7 +70,6 @@ ol.layer.Vector.prototype.getRenderOrder = function() {
  * option at construction or to the `setStyle` method.
  * @return {ol.style.Style|Array.<ol.style.Style>|ol.feature.StyleFunction}
  *     Layer style.
- * @todo stability experimental
  * @todo api
  */
 ol.layer.Vector.prototype.getStyle = function() {
@@ -82,7 +80,6 @@ ol.layer.Vector.prototype.getStyle = function() {
 /**
  * Get the style function.
  * @return {ol.feature.StyleFunction|undefined} Layer style function.
- * @todo stability experimental
  * @todo api
  */
 ol.layer.Vector.prototype.getStyleFunction = function() {
@@ -105,7 +102,6 @@ ol.layer.Vector.prototype.setRenderOrder = function(renderOrder) {
  * an array of styles.
  * @param {ol.style.Style|Array.<ol.style.Style>|ol.feature.StyleFunction} style
  *     Layer style.
- * @todo stability experimental
  * @todo api
  */
 ol.layer.Vector.prototype.setStyle = function(style) {