[FEATURE] Allow the last line of new structures to not end in a comma

[BigBadE]

Describe Your Feature
Structures should be allowed to have the last value not end in a comma.
Currently, it must always end in a comma or an error is thrown.

Provide a Code Snippet Using Your Feature

struct Test {
    value: u64;
}

fn main() {
    let test = new Test {
        value: 0
    };
}

Additional Information
Look at how CodeEnd handles returning with a value and how Structure changes the state of code parsing.

[ElectrifyPro]

I'd like to work on this

[BigBadE]

It seems like the PR didn't fix the issue when I added a test for it, but I may have broken it.