Remove deprecation warning

[saguywalker]

Remove deprecation warnings for

1. parentheses are required around the parameter of a lambda.
2. method long2double in object Long is deprecated since 2.13.1: Implicit conversion from Long to Double is dangerous because it loses precision.
3. method << in class Int is deprecated since 2.12.7: shifting a value by a Long argument is deprecated (except when the value is a Long)
4. method - in trait MapOps is deprecated since 2.13.0: Use -- with an explicit collection
5. method base64Bytes in class JerryStringer is deprecated since 0.0.1-M12: use .b64Bytes functions.