this allows for putting a JSON representation of a config into the user
config area of a binary to be flashed on the board. this allows for
conveying configs as simple JSON files and using them to convey specific
binaries by parts
this is the start of the support to use JSON files on a *new* section of
the binary reserved for board default configs
Signed-off-by: Brian S. Stephan <bss@incorporeal.org>
prior to this, the concatenate assumed it was concatenating a firmware
with a full *storage section*, e.g. the already-padded 8192 bytes, but
it's equally valuable now that I'm creating configs to have just a
config section + footer, which needs to be padded 8192. now concatenate
supports both
