Create DurationDelta converter and humanize timedelta output for Slowmode cog.

The DurationDelta converter will allow the Slowmode cog to use a formatted timestamp instead of an integer representing seconds. I created a new converter because the Duration converter returned a datetime.datetime object, instead of a time delta.
Joe mentioned that I could just subtract the datetime.datetime object from datetime.utcnow(), but there is a small delay between conversion and when the function is actually executed.
This caused something like `!slowmode set #python-general 5s` to set the slowmode delay to 4 seconds instead of 5.

Now, with this new converter, the set command can be invoked using a formatted timestamp like so: `!slowmode set #python-general 4h23M19s`. This would set the slowmode delay in #python-general to 4 hours, 23 minutes, and 19 seconds.
Of course that delay would be quite overkill for #python-general, but that's just for the sake of this example.

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