message: Add header files to demos CMakeLists.txt
  Helpful for source browsing when using an IDE project generated by CMake
  Potential list of header files found using:
  find util/test/demos -name '*.h' \! -path "*3rdparty*" \! -path "*official*"
diff: @@ -4,8 +4,11 @@ set(PROJECT demos)
  set(VULKAN_SRC
  3rdparty/volk/volk.c
  + vk/vk_headers.h
  vk/vk_helpers.cpp
  + vk/vk_helpers.h
  vk/vk_test.cpp
  + vk/vk_test.h
  vk/vk_adv_cbuffer_zoo.cpp
  vk/vk_buffer_truncation.cpp
  vk/vk_cbuffer_zoo.cpp
  @@ -63,6 +66,7 @@ set(VULKAN_SRC
  set(OPENGL_SRC
  3rdparty/glad/glad.c
  gl/gl_test.cpp
  + gl/gl_test.h
  gl/gl_buffer_resizing.cpp
  gl/gl_buffer_spam.cpp
  gl/gl_buffer_truncation.cpp
  @@ -105,7 +109,9 @@ set(OPENGL_SRC
  set(SRC main.cpp
  3rdparty/fmt/format.cc
  + renderdoc_app.h
  test_common.cpp
  + test_common.h
  texture_zoo.cpp)
  project(demos)
  @@ -123,7 +129,9 @@ if(NOT APPLE AND UNIX)
  gl/gl_test_linux.cpp)
  list(APPEND SRC
  linux/linux_platform.cpp
  - linux/linux_window.cpp)
  + linux/linux_platform.h
  + linux/linux_window.cpp
  + linux/linux_window.h)
  add_executable(demos ${SRC} ${VULKAN_SRC} ${OPENGL_SRC})
  endif()
  