Remove ES_NEXT macro (#4915)

- remove all '#JERRY_ESNEXT' macro
- remove 5.1 build profile, update test runner accordingly (Note: all builtins are turn on by default)
- move tests from tests/jerry/esnext into tests/jerry, concatenate files with same names
- add skiplist to some snapshot tests that were supported only in 5.1
- fix doxygen issues that were hidden before (bc. of es.next macro)

Co-authored-by: Martin Negyokru negyokru@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/string-prototype-startswith.js

@@ -0,0 +1,73 @@
+// 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.
+
+var x = "My cat is awesome";
+assert (x.startsWith ("My"));
+assert (x.startsWith ("cat", 3));
+assert (x.startsWith ("awesome", 10));
+assert (x.startsWith (""));
+assert (x.startsWith ("", 1));
+assert (x.startsWith ("", 17));
+assert (x.startsWith ([]));
+
+assert (x.startsWith ("doggo") === false);
+assert (x.startsWith ("awesome", 2) === false);
+assert (x.startsWith ("awesome", "oi") === false);
+assert (x.startsWith ("kitten", 30) === false);
+assert (x.startsWith (undefined) === false);
+assert(String.prototype.startsWith.call (5) === false);
+
+var test_obj = {toString: function() { return "The world of Eorzea"; } };
+test_obj.startsWith = String.prototype.startsWith;
+assert (test_obj.startsWith ("The") === true);
+assert (test_obj.startsWith ("Viera") === false);
+
+try {
+  String.prototype.startsWith.call (Symbol());
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+try {
+  String.prototype.startsWith.call (undefined);
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+y = /[/]/;
+try {
+  x.startsWith (y);
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+y[Symbol.match] = false;
+assert(x.startsWith(y) === false);
+
+try {
+  "foo".startsWith({[Symbol.match] : true});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+try {
+  "foo".startsWith({get [Symbol.match] () { throw 5}});
+  assert(false);
+} catch (e) {
+  assert(e === 5);
+}