Add support for Badges

[NickIsADev]

This pull request creates a new Enum, enum.userFlag, creates a new Resolver, Resolver.userFlag(), a new User getter, get.badges(), and a new User method, User:hasBadge(User-Flag-Resolvable). These all allow for Badges support.

• get.badges() returns an array of strings which represent the badge's name (which matches up with the Enum).
• User:hasBadge() returns a boolean indicating whether or not the user has the specified User-Flag-Resolvable.

Most of this was derived from Message Flags to maintain consistency.

Both the getter and the method have been tested.

One thing to note it that the staff badge does not seem to be able to be read due to its bit. I wasn't entirely sure what to do with the enum so I ended up keeping it. Another thing I wasnt so sure about was whether User:hasBadge() should return the flag value, or the badge name. It was agreed upon in the Discordia server that the badge name would be easier to handle.

The raw property of a User that provides the functionality of Badges is User._public_flags. The documentation can be found here.

[SinisterRectus]

This looks great except I would prefer to use the API term "flag" everywhere instead of using the product term "badge". So, user:hasFlag instead of user:hasBadge and user.flags instead of user.badges.

[SinisterRectus]

I'm not sure I like the user.badges or user.flags property, but it's probably the best we can do. For permissions, we have a dedicated class so that member:getPermissions():toArray() gives the list of names, but I'm not about to recommend a UserFlag class. This is expected to handled more generically in 3.x with a Bitfield class that can represent any type of bitfield/flag/enum beyond just permissions.

[Bilal2453]

This should either say table or it should return an ArrayIterable instead of a table (I recommend this), Array on its own is not a valid type.

[Bilal2453]

Note that this method works differently compared to something like Message:hasFlag(), which checks for the presence of any of the provided flags. Might want to change it to how Message does it, or vise versa.