ocl_minMaxIdx to call minmaxloc.cl for OpenCL 1.2+ only

fix: typo in opencv-python tutorials

Fix issue 22837: No more blank buttons on toolbar after resizing the window

imgcodecs: ensure parameters are key-value pairs, fix HDR encoder

backport #22737: Cocoa/highgui: Set [NSApp activateIgnoringOtherApps] to spawn window on top

Fix #22767: Ensure that the buttons are spaced to the size of the toolbar window, which is always visible. (rebased to 3.x)

define the number of dstChannels for HLS and HSV conversion as well

* 3rdparty: zlib 1.2.12 => 1.2.13

https://github.com/madler/zlib/releases/tag/v1.2.13

- replace README -> LICENSE in install distribution

* 3rdparty(zlib): re-apply patch 20190330-ununitialized-use-state-check.diff

Fix infinit loop in tf 3.4 branch

ts: basic documentation for utility scripts

Replace the chessboard.png image with the pattern.png image since the chessboard.png image does not have proper squares which is not good for camera calibration accuracy.

docs: prefer # for links generation

- avoid `@ref`
- align with 4.x branch (minimize merge conflicts)