Move vector_size_t and vector_vector_Mat

These two typdefs are not compiled when BUILD_opencv_dnn is set to
false, however there are other modules that uses these typedef so
it may cause build errors. Moving typedef to the python module
ensures they are always defined.

modules/dnn/misc/python/pyopencv_dnn.hpp

@@ -2,8 +2,7 @@
 typedef dnn::DictValue LayerId;
 typedef std::vector<dnn::MatShape> vector_MatShape;
 typedef std::vector<std::vector<dnn::MatShape> > vector_vector_MatShape;
-typedef std::vector<size_t> vector_size_t;
+
-typedef std::vector<std::vector<Mat> > vector_vector_Mat;
 
 template<>
 bool pyopencv_to(PyObject *o, dnn::DictValue &dv, const char *name)

modules/python/src2/cv2.cpp

@@ -89,6 +89,7 @@ typedef std::vector<char> vector_char;
 typedef std::vector<int> vector_int;
 typedef std::vector<float> vector_float;
 typedef std::vector<double> vector_double;
+typedef std::vector<size_t> vector_size_t;
 typedef std::vector<Point> vector_Point;
 typedef std::vector<Point2f> vector_Point2f;
 typedef std::vector<Point3f> vector_Point3f;
@@ -101,6 +102,7 @@ typedef std::vector<Rect> vector_Rect;
 typedef std::vector<Rect2d> vector_Rect2d;
 typedef std::vector<KeyPoint> vector_KeyPoint;
 typedef std::vector<Mat> vector_Mat;
+typedef std::vector<std::vector<Mat> > vector_vector_Mat;
 typedef std::vector<UMat> vector_UMat;
 typedef std::vector<DMatch> vector_DMatch;
 typedef std::vector<String> vector_String;