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Vendor-provided .bin files have repeatedly demonstrated that our
previous interpretation of this field as version[0] is likely
wrong. Instead, it seems to represent the file size (in bytes)
of the .bin file.

This commit fixes both decompilation (and header checks) and
generation of .bin files, where it will now store the size to
this field.

TODO: It's unclear whether the 'filesize' needs some specific
alignment (and the .bin corresponding padding). A value of
34864 (0x8830) has already been observed, so any possible
alignment is expected not to exceed 16 bytes (0x10). (Currently
our .bin generator doesn't care about any specific alignment.)
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>