DNN: Let Slice layer support non-sequential and negative axes

Enable issue template chooser

* cmake: Fix DirectX detection in mingw

The pragma comment directive is valid for MSVC only. So, the DirectX detection
fails in mingw. The failure is fixed by adding the required linking library
(here d3d11) in the try_compile() function in OpenCVDetectDirectX.cmake file.
Also add a message if the first DirectX check fails.

* gapi: Fix compilation with mingw

These changes remove MSVC specific pragma directive. The compilation fails at
linking time due to absence of proper linking library. The required libraries
are added in corresponding CMakeLists.txt file.

* samples: Fix compilation with mingw

These changes remove MSVC specific pragma directive. The compilation fails at
linking time due to absence of proper linking library. The required libraries
are added in corresponding CMakeLists.txt file.

request and documentation

refactor the code for parsing Slice layer
add test for Slice layer
let 'begin' and 'end' resize to dims
add opset message comment

fix warnings in ImageCollection

Add StackBlur for imgproc

Fixed most clang -Wextra-semi warnings

DNN: Remove unused code in onnx_importer.cpp

QRcode, change INTER_LINEAR to INTER_LINEAR_EXACT

fix python test_detect_and_decode_multi, sort QR in multiDetect/multiDecode
enable tests with "version_5_up.jpg", "version_5_top.jpg"

Fix multiple sdtlib linkage warning on Windows with MSVS.

OpenCV for OpenVINO documentation

[G-API] Pipeline modeling tool - support local infer node config

Use global OpenCV settings for MS Visual Studio run-time libraries to prevent colision.

riscv: use /opt/riscv path in toolchain

- align with defaults from https://github.com/riscv-collab/riscv-gnu-toolchain

Fix v_signmask for RISC-V Vector

[GSoC 2022] Multipage Image Decoder API

Detect RISC-V compiler from PATH environment variable

Disabled compiling warnings in case of symbols in cmake for 4.x

GitHub Workflows security hardening

Signed-off-by: NAlex <aleksandrosansan@gmail.com>

Signed-off-by: NAlex <aleksandrosansan@gmail.com>

Stereo Calibration: Return rotation and transformation vectors for each calibration object

Add flag to pass initial guess for camera intrinsics into the calibration exe