编排补全uTools接口，新增获取选中文件、图片、文字

plugin/lib/quickcomposer/status/index.js

@@ -0,0 +1,7 @@
+const getSelected = require("./getSelected");
+
+module.exports = {
+  getSelectedText: getSelected.text,
+  getSelectedImage: getSelected.image,
+  getSelectedFiles: getSelected.files,
+};