Esc menu without "Exportieren"; export screen mod removed

- cUI_EscMenu::BuildLines hook: the UI_ESC_EXPORT line is removed, the
  lines below move up, the window shrinks by one line, centred.
- game/ui/control.h: control vector helpers (ControlsIn, RemoveControl,
  SetControlAt, DeleteControl, ControlNamed), used by the main menu too.
- The export screen is unreachable now: charexport.cpp and
  docs/char-export.md deleted. Spielen screen redesign noted in todo.md.

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

docs/todo.md

@@ -182,13 +182,10 @@ From the characters rework (`docs/characters.md`, request of 2026-10-19):
 - **Unlock difficulties by story completion.** Bronze and Silber stay open;
   difficulty d >= 2 opens when the story on d - 1 is completed. The counters
   are one byte per difficulty in cStatsManager +0x5704 (read 0x424be0) and
-  travel in the save header (+0x88..+0x98) and the hero file. Today every
-  difficulty up to the highest played one is offered (and Silber).
+  travel in the save header (+0x88..+0x98) and the hero file. Done
+  2026-10-20 (docs/characters.md).
 - **Reset a difficulty.** Remove one world from a character (the shared hero
   stays); a button / dialog entry in the load window.
-- **Remove the export / import UI.** The Esc menu's "Exportieren" and the
-  character screen's import (cUI_Character mode 5, `docs/char-export.md`):
-  characters replace exported heroes.
 - **Silent autosave every 10 minutes** (a setting later) into the
   autosave file, without the busy dialog, like the direct save
   (`SaveOnTick`) but marked as an autosave.
@@ -196,3 +193,11 @@ From the characters rework (`docs/characters.md`, request of 2026-10-19):
   current character, but the quickload event (0x116, engine +0x68 = row,
   flag 0x200) loads `GAME00.PAK`, which is not listed; make it reload the
   current character's world (or its newer autosave).
+
+## Savegames screen redesign ("Spielen")
+
+Asked 2026-10-20: redesign the load window (cUI_Savegame, the "Spielen"
+screen, characters.cpp): show a render of the selected character, use the
+space far better. The user looks for 16:9 artwork so the screens can be
+widened beyond the 1024 frame (now drawn in a centred 1024x768 viewport with
+black sides, hud.cpp FrameScope).