Flight statistics (odometer) added.

Supported counters:
- total flights count
- total flight time
- total flight distance (if GPS available)

src/main/fc/core.c

@@ -65,6 +65,7 @@
 #include "fc/rc_adjustments.h"
 #include "fc/rc_controls.h"
 #include "fc/runtime_config.h"
+#include "fc/stats.h"
 
 #include "msp/msp_serial.h"
 
@@ -370,6 +371,8 @@ void disarm(void)
 #endif
         flipOverAfterCrashActive = false;
 
+        statsOnDisarm();
+
         // if ARMING_DISABLED_RUNAWAY_TAKEOFF is set then we want to play it's beep pattern instead
         if (!(getArmingDisableFlags() & ARMING_DISABLED_RUNAWAY_TAKEOFF)) {
             beeper(BEEPER_DISARMING);      // emit disarm tone
@@ -483,6 +486,7 @@ void tryArm(void)
 #else
         beeper(BEEPER_ARMING);
 #endif
+        statsOnArm();
 
 #ifdef USE_RUNAWAY_TAKEOFF
         runawayTakeoffDeactivateUs = 0;
@@ -973,7 +977,10 @@ bool processRx(timeUs_t currentTimeUs)
 #endif
 
     pidSetAntiGravityState(IS_RC_MODE_ACTIVE(BOXANTIGRAVITY) || featureIsEnabled(FEATURE_ANTI_GRAVITY));
-    
+
+    /* allow the stats collector to do periodic tasks */
+    statsOnLoop();
+
     return true;
 }