Draw aids to navigation as buoys

A buoy, beacon, RACON, light or IALA mark in the vessel feed was drawn
as a ship. A vessel record whose type names one, or whose MMSI is an
aid-to-navigation station's (99MIDxxxx), is now isAidToNavigation and
vesselModelSpec draws it as the fleet set's buoy of its mark (cardinal
N/E/S/W, port or starboard hand, safe water, isolated danger, special
mark; a red can when the type names no mark), at its built size and
flagged fixed so its model does not turn to a heading. Its icon is a
disc instead of a chevron.

AISStream now subscribes to AidsToNavigationReport by default, and the
server names each report's aid type code (0 to 31) as its kind instead
of reading it as a ship type.

.env.example

@@ -176,7 +176,7 @@ VITE_AIS_LIVE_LABEL_MAX_ROWS=900
 AISSTREAM_API_KEY=
 # Optional AISStream subscription filters.
 # AISSTREAM_BOUNDING_BOXES=[[[-90,-180],[90,180]]]
-# AISSTREAM_MESSAGE_TYPES=PositionReport,StandardClassBPositionReport,ExtendedClassBPositionReport,ShipStaticData,StaticDataReport
+# AISSTREAM_MESSAGE_TYPES=PositionReport,StandardClassBPositionReport,ExtendedClassBPositionReport,ShipStaticData,StaticDataReport,AidsToNavigationReport
 # Feed watchdog: silence (ms) after which the feed is REPORTED stale; the socket
 # is recycled at 2.5x that. Default 120000. The watchdog self-arms only for the
 # default worldwide subscription — a narrow filter above can be legitimately