Better desktop USB-C port grouping, Thunderbolt tunnel paths, and a probing compatibility switch

This release focuses on how WhatCable reads desktop Macs (mini, Studio) and
Thunderbolt docks, plus a compatibility switch for Macs where deep USB
probing misbehaves.

What's new

• Desktop built-in USB ports no longer group under a Thunderbolt dock.
  On a Mac mini or Studio, the machine's own front USB-C ports were being
  drawn as if they hung off a connected dock. They now show in their own
  "Built-in USB ports" section. Thanks @toofishes for the report (#417).

• Devices behind a dock on a front USB-C port now show up. Plugging a
  dock into a Mac mini or Studio front port used to list the dock's own hubs
  but drop everything plugged into the dock (drives, phones, audio). Those
  devices now appear, nested under the dock. Thanks @jimmyorz for the report
  and the testing (#430).

• Connected devices tree roots under the Thunderbolt link (Pro). The
  device tree now shows the downstream Thunderbolt device with its live link
  speed at the top, plus tunnel-path attribution: which display or data
  tunnel each device is riding (#411).

• New "Skip deep USB probing" compatibility switch. A few KVM switches
  and hubs react badly to deep USB probing. Settings now has a switch to turn
  it off if probing ever stalls or misbehaves on your Mac; everything else
  keeps working (#429).

Under the hood

• Test-kit probe hardening and a correction to how hardware identifiers are
  captured (#401, #405).
• Internal correctness fixes to USB and power port join keys.
• Cable database updates: several newly reported cables added, and a
  Thunderbolt adapter relabelled.