Request for additional import capabilities: import without overwriting

[ryanmcfall]

I would like the ability to to import a JSON file containing several snippets without overwriting the existing snippets. As far as I can tell, this is not currently possible.

Looking at the code, it seems that one way of accomplishing this would be to import the new snippets into a newly created empty snippet folder. That looks like it wouldn't be a hard change to make, and would be a reasonable compromise as a start.

I might be able to find some time to work on this if you agree it would be a good feature.

[tahabasri]

Thanks @ryanmcfall for the great feedback, I agree that it's a very good feature, I don't have much time to develop it for the time being, so if you ever initialize a PR, it would accelerate things for me, thanks in advance.