Phinet DWConv Autopad for different kernel shapes

[sciapponi]

Row 452 in micromind.networks.phinet:

change:

padding=k_size // 2 if stride == 1 else (padding[1], padding[3]),

to

padding=k_size // 2 if isinstance(k_size, int) and stride==1 else [x // 2 for x in k_size] if stride == 1 else (padding[1],padding[3]),