message: examples: Add option (OFF by default) to build ImGui based demo
diff: cmake_minimum_required(VERSION 2.8)
  project(examples)
  +############################### Options #######################################
  +option(WITH_IMGUI "Build ImGui based examples?" OFF)
  +
  # Dependecies that can be accessed by any example
  add_subdirectory(deps/imgui)
  # Examples
  add_subdirectory(aditof-demo)
  +if (WITH_IMGUI)
  add_subdirectory(aditof-demo-imgui)
  +endif()
  add_subdirectory(first-frame)
  if (WITH_NETWORK)
  