improve kfactor support

add per camera gain
add the ability to save plot to vector pdf
add the ability to plot uint8_t mat types

src/profile.h

@@ -18,6 +18,7 @@ public:
 	cv::Mat darkmap;
 	cv::Mat bgmask;
 	cam::Camera::BayerMode bayerMode = cam::Camera::BAYER_BLUE;
+	double gain = 1.0;
 	void store(const QString& filename) const;
 	void load(const QString& name, size_t cameraId);
 };