Display Uint8Array as bytes in Raw Message panel

[rgov]

We have message types that use a Uint8Array instead of a string to contain a series of bytes.

The Raw Message panel just shows this as an array of decimal values. It would be great if I could view the array in some other way, like a hex editor view that shows the bytes that are in ASCII.

(The clipboard button works to transfer the data to Python for decoding, but it does so by copying each value on its own line, which is inconvenient.)