[nostalgia/core] Add support for drawing NostalgiaGraphics in SDL

src/nostalgia/core/studio/imgconv.cpp

@@ -75,7 +75,7 @@ namespace {
 
 	QMap<QRgb, int> colors;
 	auto ng = std::make_unique<core::NostalgiaGraphic>();
-	ng->pal.resize(countColors(src, argTiles));
+	ng->pal.colors.resize(countColors(src, argTiles));
 	if (argBpp == 4) {
 		ng->tiles.resize(Pixels / 2);
 	} else {
@@ -112,7 +112,7 @@ namespace {
 	// store colors in palette with the corresponding color id
 	for (auto key : colors.keys()) {
 		auto colorId = colors[key];
-		ng->pal[colorId] = toGbaColor(key);
+		ng->pal.colors[colorId] = toGbaColor(key);
 	}
 
 	return ng;

src/nostalgia/core/studio/import_tilesheet_wizard.cpp

@@ -73,7 +73,7 @@ int ImportTilesheetWizardPalettePage::accept() {
 	if (palette != PaletteOptions.indexOf(PaletteOption_Bundle)) {
 		const auto outPath = PaletteDir + paletteName + FileExt_npal;
 		core::NostalgiaPalette pal;
-		pal.colors = std::move(ng->pal);
+		pal = std::move(ng->pal);
 		auto [buff, err] = toBuffer(&pal);
 		oxReturnError(err);
 		oxReturnError(m_ctx->project->write(outPath, buff.data(), buff.size()));