Use UUIDs for Bookmark unique ID
I was trying to generate URIs for Bookmarks based on (profile, crc32(url), created). I failed at that. CRC32s are unsigned ints, and our schema code didn't like that. On top of that, my code to encode and restore created timestamps was problematic. So, I switched back to using a meaningless unique ID for Bookmarks. One way to do this would be to use an auto-incrementing integer ID. However, we've been kind of crabbed out a few times for exposing auto-incrementing integer IDs as URIs, so I thought maybe using a random UUID would be a better way to do it. So, this patch sets random UUIDs for URIs of bookmarks.
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