[Bleeding] Improve alias system.

Adds a large expansion of the aliases system. Aliases can now take arguments,
reorder their arguments, and only pass certain arguments to certain commands.
New syntax added to the aliases are $1 for optional arguments, $$1 for
required arguments, $1- for optionally using all the arguments from the
specified position onward, and $$1- to do the same thing but require at least
the specified position exist. These exist for numbers 1 through 9. You are
able to pass arguments to one command of a multiple command argument and not
others. You can also use the argument as a prefix and/or suffix. A raw $ can
be represented in the arguments by using \$.

Examples:

aliases:
# Usage: /testobjective score_deaths 1 5
testobjective:
- "testfor @p[$$1=$$3,$$1_min=$$2]"

# Usage: /ban Amaranthus Because reasons
ban:
- ban $$1 $2-
- say Banned $$1

# Usage: /icanhasbukkit
icanhasbukkit:
- version

# Usage: /icanhasplugin HomeBukkit
icanhasplugin:
- version $$1

One change from the previous aliases system is that commands are no longer
passed all arguments implicitly. You must explicitly pass the arguments
you want to pass to the command.

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