Music: local files, online radio, equaliser, queue, and a Music page in the menu

Sources
- Local Files: add a folder of music from the setup page (MP3, M4A, AAC, Ogg,
  FLAC, WAV; up to 200 songs a folder, 12 folders). Names and covers come from
  the files' tags. Each folder is a tile in its own row.
- Online Radio: find stations by name (radio-browser.info) or add a stream's
  address (MP3, AAC, .pls, .m3u; no HLS). Each station is a tile in its own
  row; the track name follows what the station sends. Up to 24.
- Both are decoded by the library built into the DLL (SpotifyHelper), which
  now plays files and HTTP streams as well as a program's output, reads tags
  and embedded pictures, and accepts MPEG-2 ADTS from AAC stations.

Sound
- Five-band equaliser (60 Hz, 250 Hz, 1 kHz, 4 kHz, 12 kHz) and loudness
  levelling, applied to every source on its way into the game.
- Loudness, the speakers option, the equaliser and levelling are now kept in
  music-settings.json between sessions.

Setup page
- Remade in the mod's own colours and type, with numbered steps per source.
- Queue pinned to the right: now playing, the playlist's songs with covers,
  find, and press to jump. Spotify's own queue shows once signed in.
- Cards for Local files and Online radio; equaliser and levelling under Sound.

In game
- MUSIC page in the menu: player and queue, sound settings, source status and
  a button for the setup page.
- "Loading song..." notice in the corner for songs that take a moment, with a
  switch to hide it. Presses made while a song is loading no longer restart it.
- The Spotify row is hidden when Spotify is not in use.
- Console: "spotify ..." is now "music ..." (music, music setup, music gain,
  music through, music spotify client|login|logout).

Logs
- The music sources' working lines (traces, per-song and per-bind lines,
  librespot's own) are debug only; stack captures are skipped unless debug
  logging is on. Grind exits: the per-pop line is debug only too.
- A "Pace:" line when the game takes the sound faster or slower than real
  time, to find why music sounds fast after tabbing back in.

Chat filter
- A run of digits is a number, not a word spelled with look-alikes: a race
  time such as 2:55.0 is no longer masked.

Runtime/bootstrap.cpp

@@ -11,6 +11,7 @@
 #include "Extension/Assets/mod_layers.h"
 #include "Extension/Assets/loose_files.h"
 #include "Extension/Scripting/custom_script_loader.h"
+#include "Extension/Scripting/lua_native_block.h"
 #include "Extension/Assets/morph_memory_pool.h"
 #include "Extension/Assets/native_render_resource_pool.h"
 #include "Extension/Rendering/display_startup.h"
@@ -43,6 +44,9 @@ bool initialize_bootstrap(std::uintptr_t base) {
     if (!stage(Channel::assets, "Native InitFS/package support", ready, error)) return false;
     error.clear(); ready = start_mod_layers(base, error);
     if (!stage(Channel::assets, "Mod layout layers", ready, error)) return false;
+    // Before anything that lets a script of the player's own into the game's Lua.
+    error.clear(); ready = start_lua_native_block(base, error);
+    if (!stage(Channel::assets, "Lua kept to Lua (no DLLs, programs, file writes or bytecode)", ready, error)) return false;
     error.clear(); ready = start_loose_files(base, error);
     if (!stage(Channel::assets, "Loose Lua/config files", ready, error)) return false;
     error.clear(); ready = start_custom_script_loader(base, error);