add blueprint tests

src/lib/core/Blueprint.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <vector>
+
+#include <QPoint>
+#include <QString>
+
+#include "BuildingType.h"
+#include "Rotation.h"
+
+struct BlueprintBuilding
+{
+    BuildingType type;
+    Rotation     rotation;
+    QPoint       offset;   // tile offset from bounding-box center (floor for even sizes)
+};
+
+struct Blueprint
+{
+    QString                        name;
+    std::vector<BlueprintBuilding> buildings;
+};