Found using `codespell -q 3 -S ./3rdparty -L activ,amin,ang,atleast,childs,dof,endwhile,halfs,hist,iff,nd,od,uint`

backporting of commit: ec43292e

This fixes a compiler error on MSVC with Unreal Engine (at least).

backport of commit: 4e998c9a

Keep a local copy of `features` from `flann::GenericIndex ` constructor (#14898)

* Fix warnings on Windows

* Fix #4376

When running with >1 OpenCV thread, KMeans index generation was
non-deterministic because of a RWW race. Issue is resolved by removing
the offending logic from the parallel section.

All <arm_neon.h> includes in core/cv_cpu_dispatch.h are protected by an
ifndef __CUDACC__ to prevent attempting to use neon intrinsics when
compiling cuda kernels (.cu) -- this prevents hard errors such as
  error: identifier "__builtin_neon_qi" is undefined

Add this same protection to flann/dist.h to fix compilation involving
flann.hpp.

* Document distance functors in dist.h

* Add spec for Distance

* Generate appropriate links for symbols

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