Re-target for ES.Next (#3901)

A list of changes:
- 'es2015-subset' profile is deprecated, and an 'es.next' profile is added.
- The default profile is changed to 'es.next'
- Renamed the JERRY_ES2015 guard to JERRY_ESNEXT
- Renamed JERRY_ES2015_BUILTIN_* guards to JERRY_BUILTIN_*
- Moved es2015 specific tests to a new 'es.next' subdirectory
- Updated docs, targets, and test runners to reflect these changes

Resolves #3737.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/jerry/es.next/class-inheritance-has-instance.js

@@ -0,0 +1,47 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Create bound implicit class constructor */
+class myArray extends Array { };
+
+var array = new myArray (1);
+array.push (2);
+assert (array.length === 2);
+assert (array instanceof myArray);
+assert (array instanceof Array);
+assert (!([] instanceof myArray));
+
+/* Add a new element to the bound function chain */
+class mySecretArray extends myArray { };
+
+var secretArray = new mySecretArray (1, 2);
+secretArray.push (3);
+assert (secretArray.length === 3);
+assert (secretArray instanceof mySecretArray);
+assert (secretArray instanceof myArray);
+assert (secretArray instanceof Array);
+assert (!([] instanceof mySecretArray));
+
+/* Add a new element to the bound function chain */
+class myEpicSecretArray extends mySecretArray { };
+
+var epicSecretArray = new myEpicSecretArray (1, 2, 3);
+epicSecretArray.push (4);
+assert (epicSecretArray.length === 4);
+assert (epicSecretArray instanceof myEpicSecretArray);
+assert (epicSecretArray instanceof mySecretArray);
+assert (epicSecretArray instanceof myArray);
+assert (epicSecretArray instanceof Array);
+assert (!([] instanceof myEpicSecretArray));