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

jerry-core/ecma/operations/ecma-array-object.h

@@ -99,7 +99,7 @@ ecma_value_t
 ecma_op_create_array_object (const ecma_value_t *arguments_list_p, ecma_length_t arguments_list_len,
                              bool is_treat_single_arg_as_length);
 
-#if ENABLED (JERRY_ES2015)
+#if ENABLED (JERRY_ESNEXT)
 ecma_value_t
 ecma_op_array_species_create (ecma_object_t *original_array_p,
                               ecma_length_t length);
@@ -107,7 +107,7 @@ ecma_op_array_species_create (ecma_object_t *original_array_p,
 ecma_value_t
 ecma_op_create_array_iterator (ecma_object_t *obj_p,
                                ecma_array_iterator_type_t type);
-#endif /* ENABLED (JERRY_ES2015) */
+#endif /* ENABLED (JERRY_ESNEXT) */
 
 ecma_value_t
 ecma_op_array_object_set_length (ecma_object_t *object_p, ecma_value_t new_value, uint32_t flags);