Receive frameCount for assets from server

src/types.ts

@@ -7,6 +7,7 @@ export type Asset = {
   key: string
   url: string
   group: 'tiles' | 'objects' | 'sprites' | 'sprite_animations' | 'sound' | 'music' | 'ui' | 'font' | 'other'
+  frameCount?: number
   frameWidth?: number
   frameHeight?: number
 }