* Add channel padding and blazeface model support.

* remove python binding

* remove std::min usage

* fix reference blob usage

* Increased padding test  coverage

* implement requested changes

* add copy_cut_border check; fix compile warnings

* update roialign

* update tool for roialign

* fix ceil for roialign

* fix ios build

* fix

* fix

* make it compatibile with the old version

* fix ios build

* trigger CI

* fix test

* order

* build

* remove code

* merge roialign

* accelerate ROIAlign

* update note

* rename func

* roialign version

* trigger CI

* fix roialign

* use ref for pre-calc in roialign

* retrigger CI

* pre-alloc

* fuse mish and depthwise convolution

* darknet2ncnn: support enet-coco conversion.

* add nv21 to rgb with half resize

* remove const decoration for int

* add swish layer

* add swish test

* add statisticspooling layer

* update my license, delete "#include <algorithm>, #include <functional>" in src/layer/statisticspooling.cpp, add ncnn_add_layer entry in src/CMakeLists.txt.

* Move ncnn_add_layer(StatisticsPooling) to tail of the layer list. Because the layer enum index is generated from this order. Inserting would break binary compatibility.