Windows warning cleanup
bladeRF-cli: Revised usage of 'calibrate' command

Added explicit parameter to denote dc calibration:
    Changed 'cal <tx|rx>' to 'cal dc <tx|rx>'
    Changed 'cal table' to 'cal table dc'

In upcoming changesets, this will allow for IQ imbalance corrections
to be accounted for.
bladeRF-cli: Moved IQ correction to 'calibrate' command.

There was some overlap in 'calibrate' and 'correct', so these two
have been consolidated.