Add byte[] type in Property.Types

[jiwonz]

Simply added byte[] in Property.Types.

This adds support for byte[] property type when serializing PROP chunk of BinaryRobloxFile.

So now BinaryStringValue.Value can be serialized properly(maybe? but I have tested with rbx-dom with Rojo and Lune)

But needs XML token for byte[] to be serialized properly for XMLRobloxFile. (They're needed to be encoded to Base64 with CDATA prefix iirc)