HEX DEBUG output in newtmgr

[Kevin Townsend]

We're currently working on a mobile version of newtmgr, and the DEBUG 
output is very useful to sanity check commands and responses, but the 
output in DEC is kind of a pain when most SW engineering on embedded 
devices is done in HEX. Is there an option I'm missing to output HEX 
instead of DEC, or is this something worth considering changing 
internally in the tool to default to HEX which feels like a far more 
natural choice from my PoV?