Fix Documentation Typos (#7942)

Append zero to trailing decimal place for FileStorage JSON write of a float or double value (#7952)

* Fix for FileStorage JSON write of a float or double value that has no fractional part; appends a zero character after the trailing decimal place to meet JSON standard.

* strlen return to size_t type rather than unnecessary cast to int

Change `<=` to `<` to avoid accessing the first character of an empty string

3.2.0

* moved BLAS/LAPACK detection scripts from opencv_contrib/dnn to the main repository.

* trying to fix the bug with undefined symbols sgesdd_ and dgesdd_

* removed extra whitespaces; disabled LAPACK on IOS

* OpenVX HAL updated to use generic OpenVX wrappers

* vxErr class from OpenVX HAL replaced with ivx::WrapperError

* reduced usage of vxImage class from OpenVX HAL replaced with ivx::Image

* vxImage class rewritten as ivx::Image subclass that calls swapHandle prior release

* Fix OpenVX HAL build

* Fix for review comments

cmake: fix ffmpeg check code (port into master #7893)

3.2.0-rc

"install DIRECTORY does not allow "COMPONENT" after PATTERN or REGEX."

find_package allows to specify optional components. This way, the
command will not fail if any of the components marked as optional was
not found. This is useful in cases where components such as xfeatures2d,
viz etc. are not available either because they were not compiled by the
user or package maintainers decided to not provide the packages at all.

The user can check the availability of the optional component using the
OpenCV_<component>_FOUND variable.