Options: tabs Allgemein / Beute / Tastenbelegung with key bindings

- Options window in three tabs; the auto-pickup settings move to Beute;
  sliders move with their page; black sides like the save game screen.
- Tastenbelegung: every binding settable (click, press key; Esc cancels,
  Backspace unbinds), "Alle zurücksetzen" as a game button, saved on OK.
- Potions bindable (default unbound), named by the game's potion texts; the
  game's own potion hotkeys are off; bar tooltips show the bound key.
- Map (M), overview map (Tab, held) and labels (Alt, held) bindable; the
  game's own M / Tab / Alt handling is switched off.
- Save game key calls the game's save window code instead of a posted key.
- Teleportationstrank: fixed text replacement from startup (also the
  Ausdauertrank items, potion kind 5 as well).

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

src/mods/hud.h

@@ -26,5 +26,8 @@ int VisibleDialogTooltips(void** out, int max);
 // shifted) or event handler (mouse position shifted by the window's offset).
 int RenderCentred(void* window, int (*body)(void* context), void* context);
 int HandleCentred(void* event, int (*body)(void* context), void* context);
+// RenderCentred for full-screen windows: black beside the 1024 frame, drawn
+// with a viewport on it (as the save game and export screens).
+int RenderFramed(void* window, void* device, int (*body)(void* context), void* context);
 
 } // namespace mods::hud