Charger wattage fix, plus clearer Intel and updater messages

Fixed

Charger wattage no longer sticks at 3W when a second device is plugged
in. Charging over MagSafe with a third-party adapter while also using a
USB-C display (or anything else on a second port) could freeze the reading
at "3W", even though the Mac was charging at full wattage. Unplugging the
display used to be the only way to correct it. Thanks @hinaloe for the clear
report and the diagnostics (#443).
Intel Macs now say why the app can't work. WhatCable relies on data
Intel Macs don't expose, so it can't report cables on them. Instead of an
empty ports list, Intel users get a clear message explaining that (#407).
Power Monitor explains a connected-but-not-selected charger. When a
charger is plugged in but the Mac isn't drawing from it, the monitor used
to spin forever (#296).
The window comes to the front in window mode when reopened (#419).
Updater gives clearer guidance when the app bundle is missing. If the
running app was moved (for example, left in Downloads), the updater now
explains what to do instead of failing with a cryptic error.

The consent sheet and privacy policy now describe exactly what the
diagnostic probes send.
Diagnostic probes are now bounded and can't run away, thanks @VailElla
(#451), and the CLI sanitises text that comes from hardware before printing
it, also @VailElla (#453).
Translation updates: Traditional Chinese, thanks @jimmyorz (#433, #447),
and Italian, thanks @bovirus (#448).

Thanks to @jimmyorz, @aguilaair and @cannotcollide for testing the beta.