A formatter for ArkScript

[SuperFola]

For the past few weeks, I've been considering to make a formatter for ArkScript code, how it should format code, what rules we would need to implement, and the potential complexity of writing such a tool.

And so I started writing one to see how it works out, see #443.

The rules implemented for now are

• functions definitions on the same line as the variable (unless the first line of the definition exceeds 32 characters):

(let foo (fun () ())
(fun (a b) (+ a b))
(fun (a) {
    a })

• comments inside the argument list splits the arguments on multiple lines

(fun (
    # a
    a
    b
    # capture
    &c)
    # body
    {})

• begin blocks are always spliting on multiple lines, and the last node before the closing } has a space to differentiate it and make it easier to read
• function calls with at least one argument that spans on multiple lines will get all their arguments on a separate line:

(list:forEach
    _listeners
    (fun (element)
        (if (= typ (@ element 0))
            {
                ((@ element 1) val)
                (set found true) })))

• conditions are spliting then/else on multiple lines

More tests need to be added to ensure that it conforms to what we expect, and more rules might be introduced. Feel free to drop a code sample to see how it is formatted, and/or rules suggestions!