Allow to skip batch of icons, if alredy existing in the collection

[Karobwe]

Is your feature request related to a problem? Please describe. We actually get a warning asking if we want to override or skip adding new icon to a collection, if an icon with same name alredy exist in that collection. But if we try to add a batch of icons at the same time, we have to manually choose between overriding or skiping, and this can be fastiduous if we have hundred of icons.

Describe the solution you'd like I'd like a checkbox for either override or skip all next icons I'm trying to add.

Additional context

[MrRobz]

Thats a good idea.