added config editor (closes #19)

src/js/popup.js

@@ -1,5 +1,7 @@
 const objToDom=obj => {
-	if(obj[Popup.EM]) {
+	if(obj instanceof Node) {
+		return obj;
+	} else if(obj[Popup.EM]) {
 		let em=document.createElement('em');
 		em.appendChild(document.createTextNode(obj[Popup.EM]));
 		return em;
@@ -27,10 +29,11 @@ const objToDom=obj => {
 }
 
 class Popup {
-	constructor(title, content=[], buttons={}) {
+	constructor(title, content=[], buttons={}, large=false) {
 		this.title=title;
 		this.content=content.map(objToDom);
 		this.buttons={...buttons};
+		this.large=large;
 	}
 
 	addContent(cnt) {
@@ -45,12 +48,18 @@ class Popup {
 	addStrong(cnt) {
 		this.content.push(objToDom({[Popup.STRONG]: cnt}));
 	}
+	addHeading(cnt, level=2) {
+		let hn=document.createElement('h'+level);
+		hn.innerText=cnt;
+		this.content.push(hn);
+	}
 
 	async display(parent=document.body) {
 		let outer=document.createElement('div');
 		outer.classList.add('popup');
 		let popup=outer.appendChild(document.createElement('div'));
 		popup.classList.add('content');
+		if(this.large) popup.classList.add('large');
 
 		let title=popup.appendChild(document.createElement('h1'));
 		title.innerText=this.title;