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/re/config.cpp

@@ -47,4 +47,13 @@ std::string ConfigString(const char* section, const char* key, const char* fallb
     return narrow;
 }
 
+void SetConfigString(const char* section, const char* key, const char* value) {
+    if (g_path.empty()) {
+        return;
+    }
+    wchar_t wide[256];
+    MultiByteToWideChar(CP_UTF8, 0, value, -1, wide, static_cast<int>(std::size(wide)));
+    WritePrivateProfileStringW(Widen(section).c_str(), Widen(key).c_str(), wide, g_path.c_str());
+}
+
 } // namespace re