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.

buildcfg/jsdoc/symbols/publish.js

@@ -14,8 +14,13 @@ var path = require('path');
 exports.publish = function(data, opts) {
   var cwd = process.cwd();
 
-  // get all doclets with the "api" property.
-  var docs = data({api: {isString: true}}).get();
+  // get all doclets with the "api" property, but no enums, typedefs and events.
+  var docs = data(
+    {api: {isString: true}},
+    {isEnum: {'!is': true}},
+    {kind: {'!is': 'typedef'}},
+    {kind: {'!is': 'event'}}
+  ).get();
 
   // get symbols data, filter out those that are members of private classes
   var symbols = docs.filter(function(doc) {