Add type="button" to all generated buttons!

This caused the weirdest bug ever with an item’s delete button becoming
the de facto submit button of a form. Holyshit.

src/collection.js

@@ -585,6 +585,7 @@ var _ = Mavo.Collection = $.Class({
 
 			if (!button) {
 				button = $.create("button", {
+					type: "button",
 					className: "mv-add",
 					textContent: this.mavo._("add-item", this)
 				});

src/mavo.js

@@ -646,6 +646,7 @@ var _ = self.Mavo = $.Class({
 				this._("item-deleted", {name: phrase}),
 				{
 					tag: "button",
+					type: "button",
 					textContent: this._("undo"),
 					events: {
 						click: evt => {

src/ui.bar.js

@@ -64,6 +64,7 @@ var _ = Mavo.UI.Bar = $.Class({
 			}
 			else if (!this[id]) {
 				this[id] = $.create("button", {
+					type: "button",
 					className: `mv-${id}`,
 					textContent: this.mavo._(id)
 				});

src/ui.itembar.js

@@ -23,10 +23,12 @@ var _ = Mavo.UI.Itembar = $.Class({
 			var buttons = [
 				{
 					tag: "button",
+					type: "button",
 					title: this.mavo._("delete-item", this.item),
 					className: "mv-delete"
 				}, {
 					tag: "button",
+					type: "button",
 					title: this.mavo._(`add-item-${this.collection.bottomUp? "after" : "before"}`, this.item),
 					className: "mv-add"
 				}
@@ -35,6 +37,7 @@ var _ = Mavo.UI.Itembar = $.Class({
 			if (this.item instanceof Mavo.Group) {
 				this.dragHandle = $.create({
 					tag: "button",
+					type: "button",
 					title: this.mavo._("drag-to-reorder", this.item),
 					className: "mv-drag-handle"
 				});

src/ui.message.js

@@ -40,6 +40,7 @@ var _ = Mavo.UI.Message = $.Class({
 
 		if (o.dismiss.button) {
 			$.create("button", {
+				type: "button",
 				className: "mv-close mv-ui",
 				textContent: "×",
 				events: {