added hash columns for faster sync check calculation

src/entities/option.js

@@ -0,0 +1,11 @@
+"use strict";
+
+const Entity = require('./entity');
+
+class Option extends Entity {
+    static get tableName() { return "options"; }
+    static get primaryKeyName() { return "name"; }
+    static get syncedProperties() { return ["name", "value"]; }
+}
+
+module.exports = Option;