* Fix warning C4267 in tools/ncnn2mem.cpp
C4267: 'return': conversion from 'size_t' to 'int', possible loss of data
* Fix warning C4267 in tools/mxnet/mxnet2ncnn.cpp
C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data
* Fix warning C4267 in src/layer/{eltwise|yolov3detectionoutput}.cpp
C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data
* Fix warnings C4244, C4267 in src/layer/yolov3detectionoutput.cpp
C4244: '=': conversion from 'int' to 'float', possible loss of data
C4244: 'initializing': conversion from 'float' to 'int', possible loss of data
C4244: 'initializing': conversion from 'double' to 'float', possible loss of data
C4244: 'return': conversion from 'double' to 'float', possible loss of data
C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data
C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
* Fix warnings C4244, C4267 in src/layer/yolodetectionoutput.cpp
C4244: '=': conversion from 'int' to 'float', possible loss of data
C4244: 'initializing': conversion from 'float' to 'int', possible loss of data
C4244: 'initializing': conversion from 'double' to 'float', possible loss of data
C4244: 'return': conversion from 'double' to 'float', possible loss of data
C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data
C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
* Fix warning C4244 in src/layer/quantize.cpp
C4244: 'initializing': conversion from 'double' to 'int', possible loss of data
* Fix warnings C4244, C4267 in src/layer/detectionoutput.cpp
C4244: '=': conversion from 'int' to 'float', possible loss of data
C4244: 'initializing': conversion from 'double' to 'float', possible loss of data
C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data
C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
* Fix warning C4244 in src/layer/roipooling.cpp
C4244: 'initializing': conversion from 'double' to 'int', possible loss of data
* Fix warning C4244 in src/layer/sigmoid.cpp
C4244: '=': conversion from 'double' to 'float', possible loss of data
* Fix warning C4267 in src/layer/slice.cpp
C4267: '=': conversion from 'size_t' to 'int', possible loss of data
C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
* Fix warning C4267 in src/layer/softmax.cpp
C4244: '=': conversion from 'double' to 'float', possible loss of data
* Fix warning C4244 in src/layer/interp.cpp
C4244: '=': conversion from 'float' to 'int', possible loss of data
C4244: 'initializing': conversion from 'double' to 'int', possible loss of data
* Fix warning C4244 in src/layer/instancenorm.cpp
C4244: 'initializing': conversion from 'double' to 'float', possible loss of data
* Fix warning C4244 in src/layer/deconvolutiondepthwise.cpp
C4244: '=': conversion from 'double' to 'float', possible loss of data
* Fix warning C4244 in src/layer/convolutiondepthwise.cpp
C4244: '=': conversion from 'double' to 'float', possible loss of data
* Fix warning C4244 in src/net.cpp
C4244: 'return': conversion from '__int64' to 'int', possible loss of data
C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data
C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
C4267: 'return': conversion from 'size_t' to 'int', possible loss of data
* Fix warning C4244 in src/layer/bnll.cpp
C4244: '=': conversion from 'double' to 'float', possible loss of data
* Fix warning C4267 in src/layer/concat.cpp
C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
* Fix warning C4267 in tools/mxnet/mxnet2ncnn.cpp
C4244: 'initializing': conversion from 'double' to 'float', possible loss of data
C4267: '=': conversion from 'size_t' to 'int', possible loss of data
C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
C4305: 'initializing': truncation from 'double' to 'float'
* [CHG]when use HybridBlock to call F.softmax,the softmax op name is "softmax"(mxnet_version:10301)
* [CHG]Remove type mismatch error when using static code detection tool