feat: 导入 NMEA-0183 GPS 协议解析库（node-nmea）

NMEA-0183 语句解析器，含 21 个语句类型 codec 与配套单元测试。

- codecs/：APB/BWC/DBT/GGA/GLL/GRMT/GSA/GSV/HDG/HDM/HDT/MWV/RDID/
  RMB/RMC/ROT/RSA/TXT/VTG/VWR/ZDA
- test/：各 codec 对应的 mocha 用例
- .github/workflows/：node与 npm-publish 流水线

许可证：MIT（原作者 James Penn）

codecs/MWV.js

@@ -0,0 +1,44 @@
+var helpers = require("../helpers.js")
+/*
+ === MWV - Wind Speed and Angle ===
+
+ ------------------------------------------------------------------------------
+ *******1   2 3   4 5
+ *******|   | |   | |
+ $--MWV,x.x,a,x.x,a*hh<CR><LF>
+ ------------------------------------------------------------------------------
+
+ Field Number:
+
+ 1. Wind Angle, 0 to 360 degrees
+ 2. Reference, R = Relative, T = True
+ 3. Wind Speed
+ 4. Wind Speed Units, K/M/N
+ 5. Status, A = Data Valid
+ 6. Checksum
+ */
+exports.TYPE = 'wind';
+exports.ID = 'MWV';
+
+exports.decode = function(fields) {
+  return {
+    sentence: exports.ID,
+    type: exports.TYPE,
+    angle: +fields[1],
+    reference: fields[2],
+    speed: +fields[3],
+    units: fields[4],
+    status: fields[5]
+  }
+}
+
+exports.encode = function(talker, msg) {
+ var result = ['$' + talker + exports.ID];
+  result.push(helpers.encodeDegrees(msg.angle));
+  result.push(msg.reference);
+  result.push(helpers.encodeFixed(msg.speed, 2));
+  result.push(msg.units);
+  result.push(typeof msg.status === undefined ? 'A' : msg.status);
+  var resultMsg = result.join(',');
+ return resultMsg + helpers.computeChecksum(resultMsg);
+}