Use SDL for ImGui

src/frontend/CMakeLists.txt

@@ -36,6 +36,8 @@ include_directories(
   ../../external/parallel-rdp/parallel-rdp-standalone/util
   ../../external/unarr
   ../../external/SDL/include
+  ../../external/imgui
+  ../../external/imgui/backends
 )
 
 option(RAPIDJSON_BUILD_DOC "Build rapidjson documentation." OFF)

src/frontend/RenderWidget.hpp

@@ -6,6 +6,12 @@
 #include <QWidget>
 #include <QWindow>
 
+#include <imgui.h>
+#include <imgui_impl_sdl3.h>
+#include <imgui_impl_vulkan.h>
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_vulkan.h>
+
 struct QtInstanceFactory : Vulkan::InstanceFactory {
   VkInstance create_instance(const VkInstanceCreateInfo *info) override {
     qVkInstance.setApiVersion({1, 3, 0});