When the ITL is missing from the capture then the topic cannot be
identified from the alias. This is now catered for.
Don't error if the message is encoded.
Display the fetched topic in info column
Parse the ping message headers.
Parse ack messages
Rearrange code
Added additional detail on the filters.
More consistent quoting.
Merge remote-tracking branch 'origin/clientCapabilities' into separateParsingAndDisplay
Merge pull from martin-cowie origin, containing separateParsingAndDisplay branch