Sketch Cache Cleaner

@error23_ The app just simplifies approach described here: https://medium.com/@thomasdegry/...

@minikin I guess it's a yes..

@error23_ in case you're not relying on automatic file versions by os, it is safe.At this moment I can't find a better way to deal with it. Any ideas are quite welcome.

@minikin I am relying on automatic file versioning and this deletes ALL revisions of ALL files. You should at least warn users about this. It has nothing to do with Caches at all, so misleading.

@minikin @fpocha All files? Not just Sketch files? That's a huge difference…

@jmsuth thanks Jon! Yes, we plan to add this in the next version :-)

@jmsuth @oparenko I've been using sketch cache cleaner, and I must say it's speeding up my sketch. But the only issue i'm getting is it's even removing my local/global sketch color swatches :( is there a way to retain them?

@fo0x cheers! :)