Added supported sentences for Beitian GPS-module

The Beitian BN-880 appears to use slightly different NEMA sentences. By
adding these sentences and calling the methods which already exist
everything seems to work as expected. This was tested on an ESP32.

The extra exception catching was needed to prevent the program from
crashing in case a "list index out of range" exception was thrown.

micropyGPS.py

@@ -497,21 +497,29 @@ class MicropyGPS(object):
                     sat_id = int(self.gps_segments[sats])
                 except ValueError:
                     return False
+                except Exception:
+                    return False
 
                 try:  # elevation can be null (no value) when not tracking
                     elevation = int(self.gps_segments[sats+1])
                 except ValueError:
                     elevation = None
+                except Exception:
+                    elevation = None
 
                 try:  # azimuth can be null (no value) when not tracking
                     azimuth = int(self.gps_segments[sats+2])
                 except ValueError:
                     azimuth = None
+                except Exception:
+                    azimuth = None
 
                 try:  # SNR can be null (no value) when not tracking
                     snr = int(self.gps_segments[sats+3])
                 except ValueError:
                     snr = None
+                except Exception:
+                    snr = None
 
             # If no PRN is found, then the sentence has no more satellites to read
             else:
@@ -809,6 +817,8 @@ class MicropyGPS(object):
                            'GPGSA': gpgsa, 'GLGSA': gpgsa,
                            'GPGSV': gpgsv, 'GLGSV': gpgsv,
                            'GPGLL': gpgll, 'GLGLL': gpgll,
+                           'GNGGA': gpgga, 'GNRMC': gprmc,
+                           'GNVTG': gpvtg,
                           }
 
 if __name__ == "__main__":