core: rework code locality

- to reduce binaries size of FFmpeg Windows wrapper
- MinGW linker doesn't support -ffunction-sections (used for FFmpeg Windows wrapper)
- move code to improve locality with its used dependencies
- move UMat::dot() to matmul.dispatch.cpp (Mat::dot() is already there)
- move UMat::inv() to lapack.cpp
- move UMat::mul() to arithm.cpp
- move UMat:eye() to matrix_operations.cpp (near setIdentity() implementation)
- move normalize(): convert_scale.cpp => norm.cpp
- move convertAndUnrollScalar(): arithm.cpp => copy.cpp
- move scalarToRawData(): array.cpp => copy.cpp
- move transpose(): matrix_operations.cpp => matrix_transform.cpp
- move flip(), rotate(): copy.cpp => matrix_transform.cpp (rotate90 uses flip and transpose)
- add 'OPENCV_CORE_EXCLUDE_C_API' CMake variable to exclude compilation of C-API functions from the core module
- matrix_wrap.cpp: add compile-time checks for CUDA/OpenGL calls
- the steps above allow to reduce FFmpeg wrapper size for ~1.5Mb (initial size of OpenCV part is about 3Mb)

backport is done to improve merge experience (less conflicts)
backport of commit: 65eb946756

modules/core/src/stat_c.cpp

@@ -5,6 +5,8 @@
 
 #include "precomp.hpp"
 
+#ifndef OPENCV_EXCLUDE_C_API
+
 CV_IMPL CvScalar cvSum( const CvArr* srcarr )
 {
     cv::Scalar sum = cv::sum(cv::cvarrToMat(srcarr, false, true, 1));
@@ -117,3 +119,5 @@ cvNorm( const void* imgA, const void* imgB, int normType, const void* maskarr )
 
     return !maskarr ? cv::norm(a, b, normType) : cv::norm(a, b, normType, mask);
 }
+
+#endif  // OPENCV_EXCLUDE_C_API