adding audio_host project for hooking noita FMOD

tools/audio_host/CMakeLists.txt

@@ -0,0 +1,13 @@
+# The 32-bit audio host (the game's FMOD DLLs are x86). Built on its own:
+#   cmake -S tools/audio_host -B build_audio32 -A Win32 && cmake --build build_audio32 --config Release
+# then audio_host.exe goes next to noita_gpu.exe (and into demo/).
+cmake_minimum_required(VERSION 3.20)
+project(audio_host CXX)
+set(CMAKE_CXX_STANDARD 17)
+add_executable(audio_host audio_host.cpp)
+target_include_directories(audio_host PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../../src)
+if(MSVC)
+  target_compile_options(audio_host PRIVATE /W4)
+  target_compile_definitions(audio_host PRIVATE _CRT_SECURE_NO_WARNINGS)
+  set_property(TARGET audio_host PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+endif()