Add AddressSanitizer support for clang-cl builds

Select the clang-cl-asan CMake preset (RelWithDebInfo, clang-cl,
ADDRESS_SANITIZER=ON) to instrument first-party code with AddressSanitizer.
The wiring lives in cmake/AddressSanitizer.cmake; SANITIZERS.md tells how to
add the clang-cl tools, build, and read the report.

Details:
- Add the clang-cl-asan preset so the asan build is one selection in Visual
  Studio, and a base for a CMakeUserPresets.json to inherit.
- Instrument first-party code only; the vendored libraries keep default flags.
- Use the release CRT and disable MSVC-STL container annotations, so
  instrumented and un-instrumented TUs stay compatible.
- Pass /bigobj to the TUs asan inflates past the COFF section cap.
- Link the asan runtime for clang-cl (lld-link does not infer it).
- Stub Bink into the exe: retail binkw32.dll cannot load in an asan process
  (its image base is the 32-bit shadow), so compile no-op exports instead.
- Route the asan report to gamedir/asan.report.<pid>, since every app is a
  WIN32 GUI app with no console to receive the default stderr report.
- Opt functions with 32-bit inline __asm out of instrumentation with
  cmake/asan-ignorelist.txt, one function at a time (asan reserves a register
  the asm needs). The rest of each translation unit stays instrumented.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CMakePresets.json

@@ -51,11 +51,30 @@
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "Release"
       }
+    },
+    {
+      "name": "clang-cl-asan",
+      "inherits": "base",
+      "displayName": "clang-cl RelWithDebInfo (AddressSanitizer)",
+      "description": "AddressSanitizer build. Needs the C++ Clang tools for Windows component; see SANITIZERS.md.",
+      "vendor": {
+        "microsoft.com/VisualStudioSettings/CMake/1.0": {
+          "hostOS": [ "Windows" ],
+          "intelliSenseMode": "windows-clang-x86"
+        }
+      },
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "RelWithDebInfo",
+        "CMAKE_C_COMPILER": "clang-cl",
+        "CMAKE_CXX_COMPILER": "clang-cl",
+        "ADDRESS_SANITIZER": "ON"
+      }
     }
   ],
   "buildPresets": [
     { "name": "msvc-relwithdebinfo", "configurePreset": "msvc-relwithdebinfo" },
     { "name": "msvc-debug", "configurePreset": "msvc-debug" },
-    { "name": "msvc-release", "configurePreset": "msvc-release" }
+    { "name": "msvc-release", "configurePreset": "msvc-release" },
+    { "name": "clang-cl-asan", "configurePreset": "clang-cl-asan" }
   ]
 }