caleb531 / imessage-conversation-analyzer / 7995169797

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Rewrite most_frequent_emojis analyzer to be substantially faster

The analyzer has been rewritten to utilize built-in pandas methods
much more efficiently. This not only has cleaned up the code
substantially, but in our testing, has effectively reduced the time
complexity from O(n^2) to O(n).

This rewrite also fixes a bug with the old algorithm where combined
emojis were double-counted (e.g. both 👨‍💻 and 👨 were counted as
separate entries, but really only 👨‍💻 was used).

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