unvivtool311

• add support for encoder to align file offsets to given power-of-two boundary (either of 0, 2, 4, 8, 16)
• add wwww support (decoder/encoder)
• CLI: add -alf<N> flag to align file offsets to given power-of-two boundary
• Python: get_info() adds dictionary entry alignfofs which is a guess on the alignment of file offsets
• Python: add support for 3.14 and 3.14t