Co-authored-by: yangfengmax <yangfengmax@didichuxing.com>

* add convolutiondepthwise/crop/sigmoid/tanh in operators.md

* sort by alphabet

* delete impl_type

* cannot delete impl_type

* cannot delete impl_type

Co-authored-by: yaobin.li <yaobin.li@rokid.com>

* add custom layer destroyer

* set default layer destroyer with 0

* enable ios arm64e

* fix build with old vulkan sdk

* link vulkan loader on macos, fix ios moltenvk library path

* there is no moltenvk arm64e library atm, link moltenvk directly for macos-arm64

* package openmp and glslang together
* find glslang targets in lib64
* define version string
* update moltenvk

Upgrade vulkansdk version:
vulkansdk-macos-1.2.135.0 -> vulkansdk-macos-1.2.162.0

Co-authored-by: yaobin.li <yaobin.li@rokid.com>

* Updated test_cpu. Using test_cpu_set for __APPLE__ platforms.

* Updated test_cpu. Added simple test for powersave.

* Updated test_cpu. Improved code covarage for `test_cpu_omp`.

When cross-compiling, such as arm-linux-gnueabihf,
x86 OpenCV may be wrongly found by tools & examples targets.
Turn tools and examples off when cross compiling.

* some ci tweaks

* workaround windows-2016 cache