Fix missed export for Windows

Core/Binning/IPixel.h

@@ -15,12 +15,13 @@
 #ifndef IPIXEL_H
 #define IPIXEL_H
 
+#include "WinDllMacros.h"
 #include "Vectors3D.h"
 
 //! Interface for a function that maps [0,1]x[0,1] to the kvectors in a pixel.
 //! @ingroup simulation
 
-class IPixel
+class BA_CORE_API_ IPixel
 {
 public:
     virtual ~IPixel() {}

Core/Instrument/RectangularDetector.h

@@ -107,7 +107,7 @@ private:
     kvector_t m_v_unit;
 };
 
-class RectangularPixel : public IPixel
+class BA_CORE_API_ RectangularPixel : public IPixel
 {
 public:
     RectangularPixel(kvector_t corner_pos, kvector_t width, kvector_t height);

Core/Instrument/SphericalDetector.h

@@ -61,7 +61,7 @@ protected:
     size_t getIndexOfSpecular(const Beam& beam) const override;
 };
 
-class SphericalPixel : public IPixel
+class BA_CORE_API_ SphericalPixel : public IPixel
 {
 public:
     SphericalPixel(const Bin1D& alpha_bin, const Bin1D& phi_bin);