Widescreen: keep original size, extend view horizontally; fix player/camera

- Default render size is 768 high and as wide as the monitor aspect
  (1835x768 on 3440x1440), scaled up: everything keeps the size players
  know and the view only grows sideways. Height=0 keeps native 1:1.
- Ground: 818/888 clip limits, screen centre floats and integer
  immediates, ground quad list (capped at 1749) moved with the tile list.
- 3D: cGranny ortho (+-512 x +-384, incl. HUD items) scaled; inverse
  projection 0x623a20 (1/1024, 1/768) follows the render size, which fixes
  the camera following the player ("outside world") and the missing
  player / ESC menu.
- tools: game-input.ps1 + autotest-load.ps1 drive the game (load the first
  save game, screenshots in-game and with the ESC menu).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tools/README.md

@@ -23,3 +23,18 @@ $env:GHIDRA_HEADLESS_MAXMEM = "8G"
 
 `ApplyRtti.java` recovers the MSVC 6 RTTI that Ghidra's own script misses:
 410 vtables, ~1200 extra functions, methods named `Class::vfNN`.
+
+## Automated in-game test
+
+`autotest-load.ps1` starts the game through the launcher, clicks
+"Spiel laden" -> "Laden" -> "Ok" (first save game), takes screenshots in-game
+and with the ESC menu open, and stops the game. `-Ini` appends temporary
+settings to `build\x86-debug\sacred_re.ini` (restored afterwards), e.g.
+
+```powershell
+.\tools\autotest-load.ps1 -Name ws_off -Ini "[widescreen]`r`nEnabled=0"
+```
+
+Click positions assume the classic menu layout scaled onto a 3440x1440
+monitor. `game-input.ps1` has the building blocks (start, click, key,
+screenshot). Don't touch mouse/keyboard while a test runs.