Define a Command subclass with root alias support

A subclass is used because cogs make copies of Command objects. They do
this to allow multiple instances of a cog to be used. If the Command
class doesn't inherently support the `root_aliases` kwarg, it won't end
up being copied when a command gets copied.

`Command.__original_kwargs__` could be updated to include the new kwarg.
However, updating it and adding the attribute to the command wouldn't be
as elegant as passing a `Command` subclass as a `cls` attribute to the
`commands.command` decorator. This is because the former requires
copying the entire code of the decorator to add the two lines into the
nested function (it's a decorator with args, hence the nested function).

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