Photoshop PSD import (Compositor 1.2.0, part one)

src/IO/PSD/PSDDocumentBuilder.h

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+#pragma once
+#include "IO/PSD/PSDTypes.h"
+#include <map>
+
+struct PSDImport {
+    int width;
+    int height;
+    double resolution;
+    std::vector<ImageLayer> layers;
+    std::vector<PSDConversion> conversions;
+};
+
+// A read Photoshop file as layers, with its conversions.
+namespace PSDDocumentBuilder {
+// Each pixel record's asset and thumbnail, off the UI thread.
+std::map<QUuid, ImportedImage> assets(const PSDDocument &document);
+PSDImport makeImport(const PSDDocument &document, const std::map<QUuid, ImportedImage> &assets = {});
+}