using dynamic import for dialogs and widgets to speed up initial load

src/public/javascripts/dialogs/markdown_import.js

@@ -25,7 +25,7 @@ async function convertMarkdownToHtml(text) {
     infoService.showMessage("Markdown content has been imported into the document.");
 }
 
-async function importMarkdownInline() {
+export async function importMarkdownInline() {
     if (utils.isElectron()) {
         const {clipboard} = require('electron');
         const text = clipboard.readText();
@@ -56,8 +56,4 @@ $importButton.click(sendForm);
 utils.bindElShortcut($dialog, 'ctrl+return', sendForm);
 
 // for CKEditor integration (button on block toolbar)
-window.glob.importMarkdownInline = importMarkdownInline;
-
-export default {
-    importMarkdownInline
-};
+window.glob.importMarkdownInline = importMarkdownInline;