AP_Scripting: added Lua example demonstrating the use of active source set

libraries/AP_Scripting/examples/active_source_set.lua

@@ -0,0 +1,12 @@
+
+--returns active source set used by EKF3
+-- can be used for infering the current source set in use without RC for autonomous source switching
+
+function update() -- this is the loop which periodically runs
+
+  gcs:send_text(0, string.format("current source  set in use :%d", ahrs:get_posvelyaw_source_set()))
+
+  return update, 1000 -- 1000ms reschedules the loop (1Hz)
+end
+
+return update() -- run immediately before starting to reschedule

libraries/AP_Scripting/generator/description/bindings.desc

@@ -54,6 +54,7 @@ singleton AP_AHRS method set_home boolean Location
 singleton AP_AHRS method get_origin boolean Location'Null
 singleton AP_AHRS method set_origin boolean Location
 singleton AP_AHRS method initialised boolean
+singleton AP_AHRS method get_posvelyaw_source_set uint8_t
 
 include AP_Arming/AP_Arming.h