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-arraybuffer.c

@@ -24,7 +24,7 @@
 #include "ecma-typedarray-object.h"
 #include "jrt.h"
 
-#if ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)
+#if ENABLED (JERRY_BUILTIN_TYPEDARRAY)
 
 #define ECMA_BUILTINS_INTERNAL
 #include "ecma-builtins-internal.h"
@@ -111,4 +111,4 @@ ecma_builtin_arraybuffer_species_get (ecma_value_t this_value) /**< This Value *
  * @}
  */
 
-#endif /* ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY) */
+#endif /* ENABLED (JERRY_BUILTIN_TYPEDARRAY) */