Update StatTree.cpp - #319

…3nks

mrjimenez flagged on PR amule-project#514 review that these three contributors
were missing from the roster:

* Werner Mahr / Vollstrecker — has merge access on amule-project/amule
  and merges incoming PRs (e.g. amule-project#430, amule-project#385, amule-project#319, amule-project#330, amule-project#286). Goes
  under Maintainers based on that role.
* Pablo Barciela / Sc0w — recent contributor, e.g. wxWidgets 3.2.6
  build fixes, GTK version-check cleanup, dropping gtk1/gtk2 support,
  Chinese translation work. Goes under Developers.
* got3nks — Wayland app_id binding + SNI tray (amule-project#508), macOS UX
  (amule-project#508), libmaxminddb CI fix (amule-project#507), ip2country/upnp/nls/boost
  hard-fail series (amule-project#509/amule-project#511/amule-project#512/amule-project#513), packaging (amule-project#510),
  docs modernize (this PR). Goes under Developers.

Other recent folks may be missing too — those can be added in
follow-up commits as they're identified. mrjimenez explicitly noted
this is the priority subset to not block the rename PR.

…3nks

mrjimenez flagged on PR #514 review that these three contributors
were missing from the roster:

* Werner Mahr / Vollstrecker — has merge access on amule-project/amule
  and merges incoming PRs (e.g. #430, #385, #319, #330, #286). Goes
  under Maintainers based on that role.
* Pablo Barciela / Sc0w — recent contributor, e.g. wxWidgets 3.2.6
  build fixes, GTK version-check cleanup, dropping gtk1/gtk2 support,
  Chinese translation work. Goes under Developers.
* got3nks — Wayland app_id binding + SNI tray (#508), macOS UX
  (#508), libmaxminddb CI fix (#507), ip2country/upnp/nls/boost
  hard-fail series (#509/#511/#512/#513), packaging (#510),
  docs modernize (this PR). Goes under Developers.

Other recent folks may be missing too — those can be added in
follow-up commits as they're identified. mrjimenez explicitly noted
this is the priority subset to not block the rename PR.

…CTag + codec fixes (amule-project#319)

* Fix CTag::operator= freeing the wrong union member

CTag holds an owned pointer (wxString* / CMD4Hash* / unsigned char*) in a
union that is only valid for string / hash / blob / bsob tags. operator=
freed that pointer keyed on the *right-hand side*'s type, so assigning a
string tag onto a slot that currently holds an int freed a garbage pointer
(the int's bits reinterpreted), corrupting the heap. std::vector<CTag>::erase()
hits this whenever it shifts a string tag over a non-string one -- observed as
a double free in a wxString destructor when a media tag set ([int length,
int bitrate, string codec]) is re-attached via AddTagUnique.

Free based on THIS tag's current type first (mirroring the destructor), then
copy from rhs (mirroring the copy constructor). Pre-existing since well before
3.0.1; independent of the media-probe change that exposes it.

* Isolate media probing on a dedicated bounded worker thread

ffprobe media-metadata extraction (amule-project#280) ran on the shared CThreadScheduler
alongside hashing and download completion. A slow or hung ffprobe -- readily
reproducible on a headless daemon -- blocked the scheduler, wedging every
download at PS_COMPLETING indefinitely and stalling shutdown.

Move probing onto a dedicated CMediaProbeThread (mirrors CPartFileHashThread),
so a stuck probe can only ever delay other probes, never completions or hashing.

Bound and make each probe killable: the ffprobe invocation is now a native
posix_spawn / CreateProcess child rather than wxExecute. wxExecute's synchronous
path is uncancellable, and its async path couples termination and pipe draining
to the main-thread event loop -- polling it from the worker is a use-after-free.
The child is waited on with a 30s wall-clock timeout and a cancel flag that
EndThread flips at shutdown; on either it is killed (by process group on POSIX,
so wrapper-style ffprobe from snap/flatpak is fully reaped) and the join returns
promptly.

Add a dedicated "Media Probe" (logMediaProbe) debug category; probe tracing
lives there rather than at normal log level.

* Prefer the video track's codec (then audio) in media probing

The probe reported the first stream's codec_name, which for a container whose
first stream is a subtitle or data track (common in mkv: a leading subrip
track) advertised e.g. "subrip" as the file's codec. Query codec_type
alongside codec_name and select the first video track's codec, falling back to
the first audio track's; subtitle / data streams never win.