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/builtin-objects/ecma-builtin-number.c

@@ -93,7 +93,7 @@ ecma_builtin_number_dispatch_construct (const ecma_value_t *arguments_list_p, /*
   }
 } /* ecma_builtin_number_dispatch_construct */
 
-#if ENABLED (JERRY_ES2015)
+#if ENABLED (JERRY_ESNEXT)
 
 /**
  * The Number object 'isFinite' routine
@@ -222,7 +222,7 @@ ecma_builtin_number_object_is_safe_integer (ecma_value_t this_arg, /**< this arg
   return ECMA_VALUE_FALSE;
 } /* ecma_builtin_number_object_is_safe_integer */
 
-#endif /* ENABLED (JERRY_ES2015) */
+#endif /* ENABLED (JERRY_ESNEXT) */
 
 /**
  * @}