Specify case style for enums

[nickrobinson251]

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[iamed2]

I think this depends on the type of enum. There are three I can think of off the top of my head that might have different rules.

The examples below should not be construed to endorse any case style.

One: The enum is a concrete type and the options are instances of the type, and they all exist in the same scope. This is what @enum does. E.g.,

@enum Fruit apple banana

Two: The enum is a scope (e.g., a module) and options are constant values of any type. E.g.:

baremodule Fruit
    const apple = 0
    const banana = 0
end

Three: The enum is an abstract type and the options are singleton subtyes. E.g.:

abstract type Fruit end
struct Apple <: Fruit end
struct Banana <: Fruit end
const apple = Apple()
const banana = Banana()