Configurable Base64 Option

[Merenon]

I know from the msgpack Linux packages, that there's an option to display binary data as base64 encoded string. This would also be helpful for this plugin:

$ msgpack2json -h
[...]
-b  Convert bin to base64 string with "base64:" prefix
-B  Convert bin to base64 string with no prefix

Which would convert, for example, to:

[
    35,
    "base64:AA==",
    1337,
]

[jx6f]

That's a nice feature, will be implemented later.