build: made environment access a separate feature

3rdparty: NDSRVP - Part 2.1: Filter-Related Functions

…cpp:4.x (opencv#26414)

* Add vanilla calibration_base from 5.x

This is from 5510571

* Have the C implementation use the new C++ one.

Remove unused internal C functions

Backport C++ stereo/stereo_geom.cpp:5.x to calib3d/stereo_geom.cpp:4.x opencv#26437

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

int64 data type support for FileStorage. 1d and empty Mat with exact dimensions opencv#26434

### Pull Request Readiness Checklist

Port of opencv#26399 to 4.x branch

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

* Change style of empty and 1d Mat in FileStorage

* Remove misleading 1d Mat test

Build fix for opencl_core.cpp

…eir Windows SDK version.

DirectML was first included with 10.0.18362.0, but dxcore.lib necessary to make the check pass was first in 10.0.19041.0.

Add note for people debugging DirectML detection failures to check their Windows SDK version.

HAL added for add(array, scalar) opencv#25624

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake