x12 gps improvement (#6570)

* Add hdop handling

* Add GPS to debug screen

* Only update PilotPos when a decent hdop is achieved

radio/src/lua/api_general.cpp

@@ -806,6 +806,7 @@ Return the internal GPS position or nil if no valid hardware found
  * 'alt' (number) internal GPS altitude in 0.1m
  * 'speed' (number) internal GPSspeed in 0.1m/s
  * 'heading'  (number) internal GPS ground course estimation in degrees * 10
+ * 'hdop' (number)  internal GPS horizontal dilution of precision
 
 @status current Introduced in 2.2.2
 */
@@ -819,6 +820,7 @@ static int luaGetTxGPS(lua_State * L)
   lua_pushtableinteger(L, "alt", gpsData.altitude);
   lua_pushtableinteger(L, "speed", gpsData.speed);
   lua_pushtableinteger(L, "heading", gpsData.groundCourse);
+  lua_pushtableinteger(L, "hdop", gpsData.hdop);
   if (gpsData.fix)
     lua_pushtableboolean(L, "fix", true);
   else