Widescreen experiment: native render size via dxwrapper, classic menus

- mods/widescreen: redirect the world view's reads of the 1024.0/768.0
  constants and the 3D ortho extents to our variables; render size =
  monitor; relocate the world view's tile draw list (1750 entries, no
  bounds check) into an enlarged object (16384 entries).
- mods/dxwrapper: route DirectDraw through dxwrapper (Dd7to9, D3D9) since
  Windows' D3D7 cannot render to targets larger than 2048; fix the game's
  device info GUID pointer that dxwrapper's enumeration leaves invalid.
  Pinned release fetched by CMake (hash-checked), installed next to the DLL.
- Main menu (UI thread) and loading screen render in a 1024x768 viewport
  and are presented scaled ("classic" layout); in-game uses the full size.
- re/patch: verified code patches (operand redirect, push immediates,
  displacements) and startup hooks; build.ps1/CMake download fixes.

In-game view untested yet; HUD still at the top-left.

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

cmake/DxWrapper.cmake

@@ -0,0 +1,40 @@
+# dxwrapper (zlib; github.com/elishacloud/dxwrapper): translates the game's
+# DirectDraw 7 / Direct3D 7 to Direct3D 9, lifting D3D7's 2048x2048 render
+# target limit. Pinned release, verified by hash; installed next to
+# sacred_re.dll in dxwrapper/ and loaded by src/mods/dxwrapper.cpp, so the
+# game folder stays untouched.
+include(FetchContent)
+
+# Some CMake builds (e.g. WinLibs/MinGW) ship curl without a CA store, so
+# HTTPS downloads fail certificate verification. Fall back to Git for
+# Windows' bundle when nothing else is configured.
+if(NOT CMAKE_TLS_CAINFO AND NOT DEFINED ENV{SSL_CERT_FILE})
+    file(TO_CMAKE_PATH "$ENV{ProgramFiles}" _program_files)
+    foreach(_bundle "${_program_files}/Git/mingw64/etc/ssl/certs/ca-bundle.crt"
+                    "${_program_files}/Git/mingw64/ssl/certs/ca-bundle.crt")
+        if(EXISTS "${_bundle}")
+            set(CMAKE_TLS_CAINFO "${_bundle}")
+            break()
+        endif()
+    endforeach()
+endif()
+
+FetchContent_Declare(dxwrapper_bin
+    URL      https://github.com/elishacloud/dxwrapper/releases/download/v1.8.8600.25/dxwrapper.zip
+    URL_HASH SHA256=3894368ebce69f348d08e189c2f0818c49aa3b18ad01e06348743bf6a29af97a
+    DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+)
+FetchContent_MakeAvailable(dxwrapper_bin)
+
+function(sacred_re_install_dxwrapper target)
+    set(_dest "$<TARGET_FILE_DIR:${target}>/dxwrapper")
+    add_custom_command(TARGET ${target} POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E make_directory "${_dest}"
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different
+            "${dxwrapper_bin_SOURCE_DIR}/Stub/ddraw.dll"
+            "${dxwrapper_bin_SOURCE_DIR}/dxwrapper.dll"
+            "${dxwrapper_bin_SOURCE_DIR}/License.txt"
+            "${CMAKE_SOURCE_DIR}/config/dxwrapper.ini"
+            "${_dest}"
+        VERBATIM)
+endfunction()