Split base64 encoded message property/header to multiple lines.

[gotthardp]

When the message property/header contains a large binary structure, the
management web-pages become a bit ugly when displaying the message
content because the binary structure is encoded as one large string.

[michaelklishin]

@gotthardp thanks, may I ask you to take a couple of screenshots before and after the change? I feel the description is lacking context a bit.

[gotthardp]

Yeah, it's not easy to describe. Have a look at the "x-amqp-1.0-properties" header.

Before: the header name is split to multiple lines and the value is so long that a horizontal scrollbar was added.

After: the header name is on a single line and the value is split to multiple lines. (Note that the font is not fixed-width, so each line has different length although the character count is the same.)

[michaelklishin]

👍