A designer before me created icons for our software in Illustrator files (i.e. icons-12x12.ai, icons-16x16.ai etc). All of them have one art board and potentially hundreds of icons in them. The process for exporting or modifying them is toggling on and off visibility of each layer. It's excruciating to work with them. I'd much rather have them in separate files or art boards but the process of doing this seems so daunting considering the amount of manual work that would have to take place.
This is an example of one of the files: https://www.evernote.com/shard/s113/sh/d27d63f7-7785-4546-9ae5-655633efd299/0929248e1446b859
Is there any tricks to automate some of the exporting or splitting them into art boards?