Found via `codespell`

- removed tr1 usage (dropped in C++17)
- moved includes of vector/map/iostream/limits into ts.hpp
- require opencv_test + anonymous namespace (added compile check)
- fixed norm() usage (must be from cvtest::norm for checks) and other conflict functions
- added missing license headers

Update miniflann.cpp

Update test_stereomatching.cpp

size_t is not supported cv::Mat type

Remove unnecessary Non-ASCII characters from source code (#9075)

* Remove unnecessary Non-ASCII characters from source code

Remove unnecessary Non-ASCII characters and replace them with ASCII
characters

* Remove dashes in the @param statement

Remove dashes and place single space in the @param statement to keep
coding style

* misc: more fixes for non-ASCII symbols

* misc: fix non-ASCII symbol in CMake file

Add missing sstream header for decl of std::ostringstream in line 104

std::rand() has no thread-safe guarantee.

Adding of destructor and placement new constructors for classes wrapped with CV_EXPORTS_W_SIMPLE macro

cosmetic changes to fix this warning.
real bugs not found

(cherry picked from commit 408107ce)

(cherry picked from commit 3934d61d)

(cherry picked from commit 32d7c195)

Backport of mariusmuja/flann@f8ca6df3.

Backport of mariusmuja/flann@f8ca6df3.

Conflicts:
	modules/contrib/include/opencv2/contrib/retina.hpp