accel and mag calibration hooks
polishing ui
serial backend support to read PID data
some initial PID tuning UI hooks
pid tuning improvements
initial support for receiver data viewing
adding some notes
saving of PID tunings is fully working now
initial UI for receiver tab
full PID tuning support

RC related tunings like expos, etc will be available inside Receiver tab
Receiver and PID tab fully implemented, enjoy
bugfix for plot re-initialization