Dear ImGui

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This chapter is coming later, this chapter is going to show you how to use Dear ImGui which is an amazing library to have fast and flexible UI for in your program. Meanwhile please visit: https://github.com/ocornut/imgui to get a look at this great tool for development, a must-have library to control your renderer/game/editor and whatever else you can think of! For a look at the amazing things people do with it, see: https://github.com/ocornut/imgui/issues/5886.