Bundle assets

[Chirunos]

It doesn't seem like assets are bundled in tags/releases and are only provided in actions (which expire after some time) so if the user doesn't have the retroarch-assets package installed or has a different version, assets aren't shown properly:

No retroarch-assets:

retroarch-assets 1.7.6+git20221024+dfsg-3 (system package):

retroarch-assets 1.19 manually downloaded from libretro/retroarch-assets:

RetroArch LTS Nightly (1.19.1 Oct 23, 2024)
Devuan 5