epic: refactor SDL2_Renderer usage to IRenderer and queued texture rendering

- Updated the testing guide to clarify the testing framework's organization and execution methods, improving user understanding.
- Refactored CMakeLists to include new platform-specific files, ensuring proper integration of the rendering backend.
- Modified main application files to utilize the new IRenderer interface, enhancing flexibility in rendering operations.
- Implemented deferred texture management in various components, allowing for more efficient graphics handling and improved performance.
- Introduced new methods for texture creation and updates, streamlining the rendering process across the application.
- Enhanced logging and error handling in the rendering pipeline to facilitate better debugging and diagnostics.

test/test_editor.cc

@@ -4,6 +4,7 @@
 
 #include "app/core/controller.h"
 #include "app/core/window.h"
+#include "app/gfx/backend/sdl2_renderer.h"
 #include "app/gui/style.h"
 #include "imgui/backends/imgui_impl_sdl2.h"
 #include "imgui/backends/imgui_impl_sdlrenderer2.h"
@@ -56,7 +57,9 @@ void TestEditor::RegisterTests(ImGuiTestEngine* engine) {
 int RunIntegrationTest() {
   yaze::core::Controller controller;
   yaze::core::Window window;
-  yaze::core::CreateWindow(window, SDL_WINDOW_RESIZABLE);
+  // Create renderer for test
+  auto test_renderer = std::make_unique<yaze::gfx::SDL2Renderer>();
+  yaze::core::CreateWindow(window, test_renderer.get(), SDL_WINDOW_RESIZABLE);
   IMGUI_CHECKVERSION();
   ImGui::CreateContext();
 
@@ -74,9 +77,9 @@ int RunIntegrationTest() {
   io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
 
   // Initialize ImGui for SDL
-  ImGui_ImplSDL2_InitForSDLRenderer(
-      controller.window(), yaze::core::Renderer::Get().renderer());
-  ImGui_ImplSDLRenderer2_Init(yaze::core::Renderer::Get().renderer());
+  SDL_Renderer* sdl_renderer = static_cast<SDL_Renderer*>(test_renderer->GetBackendRenderer());
+  ImGui_ImplSDL2_InitForSDLRenderer(controller.window(), sdl_renderer);
+  ImGui_ImplSDLRenderer2_Init(sdl_renderer);
 
   yaze::test::TestEditor test_editor;
 #ifdef IMGUI_ENABLE_TEST_ENGINE