[patch] Split Alignment out of the Section Characteristics

[Rafael Espíndola]

Hi Michael,

I have converted obj2yaml to use yamlo. One problem I found comparing
a yaml -> .o -> yaml roundtrip is the section alignment. Unlike the
rest of the Characteristics field, it is just a plain byte, not a
series of flags. This causes a IMAGE_SCN_ALIGN_16BYTES  to be printed
as

IMAGE_SCN_ALIGN_16BYTES,  IMAGE_SCN_ALIGN_8BYTES, IMAGE_SCN_ALIGN_1BYTES

Since the yaml representation has a more semantic view of the file, I
think the best solution is to just add a distinct field for alignment
in the yaml representation.

Cheers,
Rafael
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