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.

src/data/vesselTypes.test.mjs

@@ -0,0 +1,47 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { aidToNavigationTypeName, isAidToNavigation } from './vesselTypes.js';
+
+test('an aid-to-navigation type code names its kind of aid', () => {
+  assert.equal(aidToNavigationTypeName(20), 'Cardinal Mark N');
+  assert.equal(aidToNavigationTypeName('13'), 'Beacon, Port hand');
+  assert.equal(aidToNavigationTypeName(2), 'RACON');
+  assert.equal(aidToNavigationTypeName(29), 'Safe Water');
+  assert.equal(aidToNavigationTypeName(31), 'Light Vessel / LANBY / Rigs');
+  // Code 0, a code past 31 and no code name no kind.
+  for (const code of [0, 32, -1, '', null, undefined, 'x'])
+    assert.equal(aidToNavigationTypeName(code), 'Navigation aid', code);
+});
+
+test('aids to navigation are known by their type, else their MMSI', () => {
+  for (const type of [
+    'Beacon, Special Mark',
+    'Cardinal Mark N',
+    'Port Hand Mark',
+    'Starboard Hand Mark',
+    'Safe Water',
+    'Isolated danger',
+    'Preferred Channel Port hand',
+    'RACON',
+    'Light Vessel / LANBY / Rigs',
+    'Reference point',
+    'Navigation aid',
+    'AtoN',
+    'Lighthouse',
+    'Buoy',
+  ])
+    assert.equal(isAidToNavigation({ type, mmsi: '' }), true, type);
+  // AIS aid-to-navigation stations are numbered 99MIDxxxx.
+  assert.equal(isAidToNavigation({ type: '', mmsi: '993672001' }), true);
+  assert.equal(isAidToNavigation({ type: '0', mmsi: ' 992351234 ' }), true);
+  for (const vessel of [
+    { type: 'Buoy Tender', mmsi: '366999001' },
+    { type: 'Buoy-Laying Vessel', mmsi: '' },
+    { type: '70', mmsi: '366999002' },
+    { type: '0', mmsi: '' },
+    { type: 'Cargo', mmsi: '99' },
+    { type: 'Passenger', mmsi: '9936720011' },
+    {},
+  ])
+    assert.equal(isAidToNavigation(vessel), false, JSON.stringify(vessel));
+});