Dev: Rename ext es6 to js

src/DevTools/Tool.js

@@ -0,0 +1,19 @@
+export default class Tool
+{
+    init($el)
+    {
+        this._$el = $el;
+    }
+    show()
+    {
+        this._$el.show();
+
+        return this;
+    }
+    hide()
+    {
+        this._$el.hide();
+
+        return this;
+    }
+}