config: start implementing json-based configuration files

src/JsonCoordinateMapping.h

@@ -0,0 +1,26 @@
+#pragma once
+#include <Figments.h>
+#include <ArduinoJson.h>
+
+struct JsonCoordinateMapping : CoordinateMapping {
+  struct Span {
+    int length = 0;
+    int x = 0;
+    int y = 0;
+
+    Span() {}
+    Span(int length, int x, int y) : length(length), x(x), y(y) {}
+  };
+
+  Span displayMap[32];
+  int strideCount = 0;
+  int maxStrideSize = 0;
+
+  void load(const JsonArray& strides);
+  void loadDefault();
+
+  VirtualCoordinates physicalToVirtualCoords(const PhysicalCoordinates localCoords) const override;
+  PhysicalCoordinates virtualToPhysicalCoords(const VirtualCoordinates virtualCoords) const override;
+  int physicalCoordsToIndex(const PhysicalCoordinates localCoords) const override;
+  unsigned int physicalPixelCount() const override;
+};