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/module-import-01.js

@@ -0,0 +1,33 @@
+/* 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.
+ */
+
+import "./module-export-01.js";
+import def from "module-export-01.js";
+import {} from "module-export-01.js";
+import {aa as a,} from "module-export-01.js";
+import {bb as b, cc as c} from "module-export-01.js";
+import {x} from "module-export-01.js";
+import * as mod from "module-export-01.js";
+
+assert (def === "default");
+assert (a === "a");
+assert (b === 5);
+assert (c(b) === 10);
+assert (Array.isArray(mod.d))
+assert (x === 42)
+assert (mod.f("str") === "str")
+
+var dog = new mod.Dog("Oddie")
+assert (dog.speak() === "Oddie barks.")