* update 3.4.20 patch

* update 4.8.0 patch

* update toolchain and ci

* split ios simulator

* fix wasm simd build

* enable cxx11 for opencv2

* workaround for macos build

* workaround for ios build

* do not convert RGB/BGR inplace on imencode/imwrite

* Update stb_image.h

* enable stbi neon

* Update highgui.cpp

* mac catalyst

* add test project

* opencv2 link openmp

* opencv 2.4.13.7 on newer msvc

* enable c++11 test

* test all packages