Depreciate FeedbackCalibration methods C_drop and...
Depreciate FeedbackCalibration methods C_drop and...

Depreciate FeedbackCalibration methods C_drop and C_filler and
replace them with lowercase c_drop and c_filler to emphasize the
fact that these capacitance values are normalized by area
(i.e., they are in units of F/mm^2).

wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware