Moved Message categories into messages.js, and include defines.js as appropriate

modules/pcx86/lib/mouse.js

@@ -36,6 +36,7 @@ if (NODE) {
     var web         = require("../../shared/lib/weblib");
     var Component   = require("../../shared/lib/component");
     var State       = require("../../shared/lib/state");
+    var PCX86       = require("./defines");
     var Messages    = require("./messages");
     var SerialPort  = require("./serialport");
 }