Add option to apply icons on multiple folders

[omegas82128]

Is your feature request related to a problem? Please describe.
If you have a large library of media and want to apply folders on all of them, doing it manually will take a lot of time. While some people might enjoy selecting a poster for every media folder, others might want to just get it done quickly. There should be a solution for that.

Describe the solution you'd like
If Aikino could set posters on an entire library of media in one go, that would be an efficient and time saving solution. Initially, it could use the default poster for the icon, but in later stages selecting different poster than default one and local posters should be integrated as well