Use Bukkit's ChatColor class for more reliable output.

This will fix some console output in Windows (maybe even other) command prompts (will add a screenshot later), and pretty much future-proofs any formatting code changes.
Also, I cleaned up the String.prototype[method] function by removing the unused "method" parameter.

I have retained the previous colors and used them as aliases.

Aliases:
* brightgreen -> green
* pink -> lightpurple
* indigo -> blue
* purple -> darkpurple
* random -> magic

Adds:
* lightpurple
* darkpurple
* magic
* darkgreen
* green