Refactor cmake build flags
Add arm linux toolchains
Add macOS+iOS build support
Support windows
Add library install
Refactor gitlab CI

  - Print feature map of each layer.
  - If op is convolution or pooling layer, print:
    stride, padding, dilation and kernel size, too.
  - For padding, if padding type is given, print 'VALID/SAME/FULL',
    else if padding values are given, print padding values.