Send games from a PC or phone browser, with a QR code on screen

Add games gets a first row, Send from PC or phone. Its screen runs a small HTTP server for as long
as it is open (port 9666, or the next one the sandbox allows) and shows the address as text and as
a QR code. The page it serves takes dropped files and whole folders, uploads them one at a time with
progress, and lists what the console did with each. Game WADs are moved into place, archives go
through the importer and are deleted afterwards, add-ons and other files are refused with a reason.

qrcodegen 1.8.0 joins the pinned third-party fetch, renamed to fetch-third-party.sh; the page is
embedded at build time by tools/embed-file.py. tools/send.py does what the page does, for console
tests with test/console-send.cfg.

README.md

@@ -6,8 +6,8 @@ id Software's original DOOM source (`linuxdoom-1.10`) running as a native PS5 ti
 home-screen icon, drawn on the GPU through Sony's AGC driver and VideoOut, DualSense input with
 analog sticks and rumble, and the DOS-era FM music synthesised from the game's own instrument bank.
 It ships with the free shareware episode of DOOM and plays The Ultimate DOOM, DOOM II and Final
-DOOM from your own game files, which it can import from a folder on the console or download from
-your PC, including straight out of ZIP, 7Z and RAR archives.
+DOOM from your own game files, which you can send from a PC or phone browser, download from a
+link or copy to the console, including straight out of ZIP, 7Z and RAR archives.
 
 ## Requirements
 
@@ -38,18 +38,23 @@ The files from the original releases and from the 2024 *DOOM + DOOM II* re-relea
 
 ### Adding your games
 
-Either way, the game files can also be inside ZIP, 7Z or RAR archives: DOOM extracts the game
+Whichever way, the game files can also be inside ZIP, 7Z or RAR archives: DOOM extracts the game
 WADs it recognises and skips everything else.
 
+- **Send them from a PC or phone.** In the game list choose *Add games...*, then *Send from PC or
+  phone*. Open the address the screen shows (for example `http://192.168.1.50:9666/`) in a browser
+  on the same network, or scan its QR code, and drop the files or whole folders on the page. Both
+  the page and the console show what was added; archives are deleted once their games are out. The
+  console only accepts files while that screen is open.
 - **Copy them to the console.** Put the files or archives in `/data/homebrew/PPSA99666/wads/` (FTP,
   ps5upload or USB). DOOM picks them up the next time it starts.
 - **Download them from a link.** In the game list choose *Add games...*, then *Link*, type an
   `http://` or `https://` address on the console keyboard and choose *Download*. The link can point
   at a WAD, an archive, or a folder; for a folder DOOM lists the files and you pick one or all.
 
-The simplest way to serve your own files from a PC on the same network is to open a terminal in the
-folder that holds them and run a small web server, then use the address it prints with your PC's
-local IP (for example `http://192.168.1.20:8000/`):
+To download from your own PC instead, open a terminal in the folder that holds the files and run a
+small web server, then use the address it prints with your PC's local IP (for example
+`http://192.168.1.20:8000/`):
 
 ```bash
 python -m http.server 8000