add sdl bmp image loader

src/image_loader_sdl_bmp.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "./image_loader.hpp"
+
+struct ImageLoaderSDLBMP : public ImageLoaderI {
+	ImageInfo loadInfoFromMemory(const uint8_t* data, uint64_t data_size) override;
+	ImageResult loadFromMemoryRGBA(const uint8_t* data, uint64_t data_size) override;
+};
+