Cubic B-spline move.
Spline can be in 3 different planes, depending of G17, G18 or G19 modal state.
G05 XYZ IJK PQR
G17 G21 G90 G91.1 G94 F1000 G0 X0 Y0 G1 X80 Y0 G5 X100 Y20 I20 J0 P0 Q-20 G1 X100 Y80 G5 X80 Y100 P20 Q0 G1 X20 Y100 G5 X0 Y80 P0 Q20 G1 X0 Y0