Add 'buffer-delete' plugin

I was having trouble with slow `<C-p>` completion, and figured out it
was due to the fact that I had about 300 buffers open.

Many of these buffers weren't being actively used, and were just loaded
in from Vim sessions past. When I removed the unloaded buffers,
completion sped up like a whistle.

Thanks to 'sidyll' (https://stackoverflow.com/users/557306/sidyll) on
Stack Overflow for explaining how to get "all" buffer numbers (or at
least all possible buffer numbers up to the highest one open), as well
as the filtering logic:
https://stackoverflow.com/questions/17931507/vimscript-number-of-listed-buffers/17933352#17933352

I leveraged the above to get the buffer numbers of all unloaded buffers,
then delete the buffers by number.

It was originally a temporary command-mode line, but I decided it could
be beneficial to save the code just in case I need it again.

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