Start from a clean slate

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diff --git a/3rdparty/imgui/backend/imgui_impl_opengl2.h b/3rdparty/imgui/backend/imgui_impl_opengl2.h
deleted file mode 100644
index d00d27f..0000000
--- a/3rdparty/imgui/backend/imgui_impl_opengl2.h
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-// dear imgui: Renderer Backend for OpenGL2 (legacy OpenGL, fixed pipeline)
-// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
-
-// Implemented features:
-//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
-
-// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. 
-// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
-// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
-// Read online: https://github.com/ocornut/imgui/tree/master/docs
-
-// **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
-// **Prefer using the code in imgui_impl_opengl3.cpp**
-// This code is mostly provided as a reference to learn how ImGui integration works, because it is shorter to read.
-// If your code is using GL3+ context or any semi modern OpenGL calls, using this is likely to make everything more
-// complicated, will require your code to reset every single OpenGL attributes to their initial state, and might
-// confuse your GPU driver.
-// The GL2 code is unable to reset attributes or even call e.g. "glUseProgram(0)" because they don't exist in that API.
-
-#pragma once
-#include "imgui.h"      // IMGUI_IMPL_API
-
-IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_Init();
-IMGUI_IMPL_API void     ImGui_ImplOpenGL2_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplOpenGL2_NewFrame();
-IMGUI_IMPL_API void     ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data);
-
-// Called by Init/NewFrame/Shutdown
-IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateFontsTexture();
-IMGUI_IMPL_API void     ImGui_ImplOpenGL2_DestroyFontsTexture();
-IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateDeviceObjects();
-IMGUI_IMPL_API void     ImGui_ImplOpenGL2_DestroyDeviceObjects();