Added icons.

lib/pixi/button.js

@@ -624,7 +624,7 @@ export default class Button extends PIXI.Container {
                 size = this.opts.minHeight - (2 * this.opts.padding)
             }
 
-            const url = Button.iconIsUrl(icon) ? icon : `../../assets/icons/png/flat/${icon}.png`
+            const url = Button.iconIsUrl(icon) ? icon : `../../assets/icons/${icon}.png`
             const iconTexture = PIXI.Texture.fromImage(url, true)
 
             const sprite = new PIXI.Sprite(iconTexture)

lib/pixi/popup.js

@@ -72,7 +72,7 @@ export class InteractivePopup extends AbstractPopup {
         // closeButton
         //-----------------
         if (this.opts.closeButton) {
-            let closeButton = PIXI.Sprite.fromImage('../../assets/icons/png/flat/close.png', true)
+            let closeButton = PIXI.Sprite.fromImage('../../assets/icons/close.png', true)
             closeButton.width = this.headerStyle.fontSize
             closeButton.height = closeButton.width
             closeButton.tint = this.theme.color2