AP_Scripting: add set angle demo

libraries/AP_Scripting/examples/set-angle.lua

@@ -0,0 +1,24 @@
+-- Example of guided mode angle control, yawing back and forth
+
+local target_yaw_1 = 45
+local target_yaw_2 = -45
+
+local target_roll = 0 -- deg
+local target_pitch = 0 -- deg
+
+local climb_rate = 0 -- m/s
+local use_yaw_rate = false
+local yaw_rate = 0 -- degs/s
+
+local flipflop = true
+function update()
+  if flipflop then
+    vehicle:set_target_angle_and_climbrate(target_roll,target_pitch,target_yaw_1,climb_rate,use_yaw_rate,yaw_rate)
+  else 
+    vehicle:set_target_angle_and_climbrate(target_roll,target_pitch,target_yaw_2,climb_rate,use_yaw_rate,yaw_rate)
+  end
+  flipflop = not flipflop
+  return update, 10000
+end
+
+return update()