- Downstream version and the upstream revision it's based on
  (commit and date)

- URL to our modified source code.

- miniaudio and libsodium versions.

- Build profile (release, dev, or debug).

Also, stop checking for updates.

Demo server was being deleted and recreated every time the lobby was
constructed, so it was always active. This rendered the "are we playing
a demo" checks useless as they always assumed we did. Logs didn't work
because of it, for example.

Construct the demo server only when the user selects demo playback, and
destroy it during the destruction of courtroom.

Make log_filename based on the application path, so `logs` subdirectory
is created relative to the executable rather than the working directory.

SFX and blip players largely remain the same.

For the music player, we now have to implement network streaming
natively, we no longer have a convenient function that did everything
for us. I introduced QNetworkRequest to download the stream in memory
and signal when it's ready to be decoded and played back. The size is
guarded to prevent the client from accidentally downloading terabytes of
audio.

Delete QFutureWatcher, we no longer need it for concurrency. miniaudio
uses a separate audio thread. Network donwloads and communication with
the track name display are handled by Qt signals.

Also, delete an odd "music.txt" feature. Its purpose was specifying
offsets for loops in a text file per track, but it remained obscure and
unused in practice.

Unsupported:

- Large streams, including unbounded ones (radio). We'll need a ring
  buffer for that, and a mechanism to write to it from the network and
  feed it to the audio thread.

- Effect flags: fade in, fade out, sync pos. Ignored.

- Audio device selection.

* Fixup evidence presentation code, methink

* Bump RC, because I can

* Playerlist QoL

* Remove excessive whitespaces

* Add placeholder when displayname is unavailable

* Make slides correctly respect X offset

* Bump to RC4 cause I am cute like that

Hack af, but the alternative is breaking compatability on the last mile.

* Use unix timestamp to transmit ban duration

* Cleanup compiler warning due to narrowing conversion

* Fix preanim not being visible

This is apparently not a feature we want from WebAO :^)

* Bump to RC2

* Use std::chrono instead

* Remove random include and debug call