[FEATURE-REQ]: Add missing icons/backdrops in skins

[raptor264]

💡 Feature request

It would be very nice if you could select application/emulator/game/, etc. icon by skin and that it is saved in that skin only so that it is consistent with the type of skin and does not bother.

[Apaczer]

Skins were made by different persons, so one or two may miss an icon or backdrop here or there. There are no active graphic designers (working on miyoo skins/visuals) in our dev team, so that's hard to accomplish in full spectrum.