Angle and NFE Racer modes

Angle-Mode and NFE-Racer mode

Angle-Mode/NFE PIDs are exposed in CLI only until 0.3.0 release.

NFE-Racer mode is equivalent of Angle-Mode on roll and Acro-Mode on pitch.

Defaults:

set nfe_racermode = OFF
set p_angle_low = 100
set d_angle_low = 10
set p_angle_high = 35
set d_angle_high = 1
set f_angle = 40
set angle_expo = 10