new and removed features/variables for Emu MSP

add_remove_MSP_variables

#replaces spa(mixed)
done: spa_roll_p
done: spa_roll_i
done: spa_roll_d

done: spa_pitch_p
done: spa_pitch_i
done: spa_pitch_d

#already there
done: spa_yaw_p
done: spa_yaw_i
done: spa_yaw_d

#replaces smart_dterm_smoothing (single)
done: smart_dterm_smoothing_roll
done: smart_dterm_smoothing_pitch
done: smart_dterm_smoothing_yaw

#replaces witchcraft (single)
done: witchcraft_roll
done: witchcraft_pitch
done: witchcraft_yaw

#REDACTED, do we need to purge from MSP?
done: gyro_average_roll
done: gyro_average_pitch
done: gyro_average_yaw

#replaces gyro_lowpass_hz single, IS THIS STAYING?
done: gyro_lowpass_hz_roll
done: gyro_lowpass_hz_pitch
done: gyro_lowpass_hz_yaw

#replaces gyro_lowpass2_hz single
done: gyro_lowpass2_hz_roll
done: gyro_lowpass2_hz_pitch
done: gyro_lowpass2_hz_yaw

#replaces dterm_lowpass_hz single
done: dterm_lowpass_hz_roll
done: dterm_lowpass_hz_pitch
done: dterm_lowpass_hz_yaw

#replaces dterm_lowpass2_hz single
done: dterm_lowpass2_hz_roll
done: dterm_lowpass2_hz_pitch
done: dterm_lowpass2_hz_yaw

not done: p_angle_low
not done: d_angle_low
not done: p_angle_high
not done: d_angle_high
not done: f_angle
not done: angle_expo

#remove!
done: dterm_notch_hz = 0
done: dterm_notch_cutoff = 0

#remove!
done: yaw_lowpass_hz

#remove!
done: acro_trainer_angle_limit
done: acro_trainer_lookahead_ms
done: acro_trainer_debug_axis
done: acro_trainer_gain

#add
not done: p_angle_low
not done: d_angle_low
not done: p_angle_high
not done: d_angle_high
not done: f_angle
not done: angle_expo

#add
not done: imuf_sharpness

#remove!
not done purge: FF (roll, pitch, yaw)

#add stick-pids
not done: set stick_center_p
not done: set stick_end_p
not done: set stick_center_d
not done: set stick_end_d

Apr 07 2020: Thanks to @loutwice

      // angle L and H
      currentPidProfile->pid[PID_LEVEL_LOW].P = sbufReadU8(src);
      currentPidProfile->pid[PID_LEVEL_LOW].D = sbufReadU8(src);
      currentPidProfile->pid[PID_LEVEL_LOW].F = sbufReadU16(src);
      currentPidProfile->pid[PID_LEVEL_HIGH].P = sbufReadU8(src);
      currentPidProfile->pid[PID_LEVEL_HIGH].D = sbufReadU8(src);

    sbufWriteU16(dst, gyroConfig()->imuf_sharpness);

    // sitckpids added in 1.46
    sbufWriteU8(dst, currentControlRateProfile->rateDynamics.rateSensCenter);
    sbufWriteU8(dst, currentControlRateProfile->rateDynamics.rateSensEnd);
    sbufWriteU8(dst, currentControlRateProfile->rateDynamics.rateCorrectionCenter);
    sbufWriteU8(dst, currentControlRateProfile->rateDynamics.rateCorrectionEnd);
    sbufWriteU8(dst, currentControlRateProfile->rateDynamics.rateWeightCenter);
    sbufWriteU8(dst, currentControlRateProfile->rateDynamics.rateWeightEnd);