* query subgroup features

* compile spirv 1.3

* drop offline spirv build

* do not build tests for android and ios, as they are never tested anyway

* code style

* set cmake NCNN_BUILD_TESTS default off and add -DNCNN_BUILD_TESTS=ON to ci

* try checkout v2 to resolve some ci issue

* delete ccpp.yml

* add build.yml

* split all workflows

* delete single file defined workflows

* light up the building status matrix

* use short icons

* add actions to ios 32bit cpu position

* rename ios workflow file's name

* rename ios workflow name