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/string-fromcodepoint.js

@@ -0,0 +1,64 @@
+// 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.
+
+// Tests with valid inputs
+assert(String.fromCodePoint(42) === "*")
+assert(String.fromCodePoint(65, 90) === "AZ");
+assert(String.fromCodePoint(0x404) === "Є");
+assert(String.fromCodePoint(194564) === "你");
+assert(String.fromCodePoint(0x1D306, 0x61, 0x1D307) === "𝌆a𝌇");
+assert(String.fromCodePoint(0x1F303) === "🌃");
+
+// Tests with invalid inputs
+try {
+    assert(String.fromCodePoint('_'));
+    assert(false);
+} catch (e) {
+    assert(e instanceof RangeError);
+}
+
+try {
+    assert(String.fromCodePoint(Infinity));
+    assert(false);
+} catch (e) {
+    assert(e instanceof RangeError);
+}
+
+try {
+    assert(String.fromCodePoint(-1));
+    assert(false);
+} catch (e) {
+    assert(e instanceof RangeError);
+}
+
+try {
+    assert(String.fromCodePoint(3.14));
+    assert(false);
+} catch (e) {
+    assert(e instanceof RangeError);
+}
+
+try {
+    assert(String.fromCodePoint(3e-2));
+    assert(false);
+} catch (e) {
+    assert(e instanceof RangeError);
+}
+
+try {
+    assert(String.fromCodePoint(NaN));
+    assert(false);
+} catch (e) {
+    assert(e instanceof RangeError);
+}