Reduce OpenCV dependencies

Remove excessive includes. Still more can be done here.

applications/calibration-multi/src/main.cpp

@@ -12,6 +12,7 @@
 #include <opencv2/core.hpp>
 #include <opencv2/aruco.hpp>
 #include <opencv2/core/eigen.hpp>
+#include <opencv2/opencv.hpp>
 
 #include <algorithm>
 #include <numeric>