move channel to class

plugins/shure/channel.js

@@ -0,0 +1,14 @@
+class Channel {
+  constructor() {
+    this.chan_name = '?';
+    this.batt_bars = 255;
+    this.batt_run_time = 65535;
+    this.audio_gain = 0;
+    this.audio_lvl = 0;
+    this.rx_rf_lvl = 0;
+    this.rf_antenna = 0;
+    this.tx_type = 0;
+  }
+}
+
+module.exports = Channel;