Show estimated GIF size in the editor window

As a user it's often hard to estimate just how big your GIF will end up being. GIFs are huge and wasteful. Would be useful to give the user an approximate size. I'm not 100% sure how, but I've seen it done in some other apps, so should be possible.

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IssueHunt Summary

Backers (Total: $100.00)

• issuehunt ($100.00)

Submitted pull Requests

• #1277 Show estimated GIF size in the editor
• #1280 Issuehunt 172 estimated gif size
• #1283 Add cancellable GIF size estimates
• #1284 Show representative GIF size estimates

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