Improvement of macOS installation guide in documentation #26564
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Missing include directories needed for wayland-util and xkbcommon #26563
See: #26561
### Pull Request Readiness Checklist
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- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
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Added Fastcv HAL changes in the 3rdparty folder.
Code Changes includes HAL code , Fastcv libs and Headers
Change-Id: I2f0ddb1f57515c82ae86ba8c2a82965b1a9626ec
Requires binaries from https://github.com/opencv/opencv_3rdparty/pull/86.
Related patch to opencv_contrib: https://github.com/opencv/opencv_contrib/pull/3811
### Pull Request Readiness Checklist
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- [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
- [ ] The PR is proposed to the proper branch
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Emscripten build fixes#26537
- Corrects typo in Emscripten-only intrinsics header (Fixes https://github.com/opencv/opencv/issues/26536)
- Updates deprecated intrinsic title (as per LLVM final intrinsic name).
### Pull Request Readiness Checklist
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HAL added for absdiff(array, scalar) + related fixes#26459
### This PR changes
* HAL for `absdiff` when one of arguments is a scalar, including multichannel arrays and scalars
* several channels support for HAL `addScalar`
* proper data type check for `addScalar` when one of arguments is a scalar
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The new C++ code is copy/pasted from OpenCV5:
- functions initIntrinsicParams2D, subMatrix (the first 160 lines)
- function prepareDistCoeffs
- the different asserts
Not all the API/code is ported to C++ yet to ease the review.
HAL added for add(array, scalar) #25624
### Pull Request Readiness Checklist
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