... instead of the PCAP returned description. This allows for a better
UX since user can more easily identify which port is which.
This will work only Windows Vista and higher since IPHLPAPI.DLL has
published APIs only for these versions. Older windows versions such as
XP will continue to use the PCAP returned description
Fixes#222
* Redesign the toolbar buttons to be similar to port stats
* Show protocols with variable fields in bold
* Variable field list will always have a 'current', if not empty
* Adding a new variable field makes it 'current' for immediate edit
* Each protocol remembers its 'current' variable field
Also renamed UserRole to a more widget specific enum
This makes it more readable. Unfortunately, the alternate row colors
don't apply to the row headers. QHeaderView is supposed to support
QBackgroundRole but there's a long pending bug on the Qt side for the
same - https://bugreports.qt.io/browse/QTBUG-31804
bps stats are derived from the Bps stats and represent line rate taking
into account the per packet overhead on the line with the following
assumptions -
* Link type is Ethernet
* Bps (and total Bytes) stats don't include the 4-byte FCS
Fixes#241
* Enable button only when one or more port is selected
* Reorder the button to make it first in the stats group
* Show some helpful text instead of a blank window when no stream stats
are available
* Rename track_stream_stats to is_tracking_stream_stats for consistency
with other bool params
* Change signature magic value to CODA
* Resolve notify memory leak
