Refactor modules into files

[andymac-2]

Fixes #97

The program is split into several modules, the largest (the info module) is already logically quite simple, and it would not make much sense to split it any further in my opinion.

I may have broken something, but as far as I can tell through my testing, this refactor went quite smoothly.

It might be good to further refactor the Info::new method to have less arguments.

I also ran rustfmt on the resulting code since I'm changing pretty much every line anyway.

[o2sh]

Why did you remove the truncate test ?

The Info module is indeed quite large.

Anyway, this is already well organized 🥇

@andymac-2 I'll let you merge your PR after the conflicts are resolved.

Thanks again!

[andymac-2]

In response to the removal of the truncate test. Consider the following test:

assert_eq!(
    Tokens("  {1} {5}  {9} a").render(&colors_shim, 4, 10),
    "\u{1b}[37m\u{1b}[0m\u{1b}[37m\u{1b}[0m\u{1b}[37m \u{1b}[0m\u{1b}[37m a\u{1b}[0m   "
);

Which used to look something like...

assert_eq!(Tokens("  {1} {5}  {9} a").truncate(4, 10), "{1}{5} {9} a");

...in a previous version of the code that had a different truncate function. The old version is easily verifiable by a human being. The new version is basically unverifiable. I ended up copying the test values from the console (which is lazy) and trusting that it was correct. That means that the test wasn't doing anything productive: it would fail every time I would change something, even if the change happened to be correct. Thus the tests were removed. Perhaps they can be replaced with tests for the tokenizer which should be verifiable by a human.

[andymac-2]

Don't merge this just yet, I've still got to update the tests.

EDIT: Done

[andymac-2]

Okay, that should be it. The tests have been updated.

[o2sh]

Oops, I went too fast.
@andymac-2 You seem to have gotten rid of my central_pad (and double line break at the end):

        let center_pad = "   ";
        loop {
            match (logo_lines.next(), info_lines.next()) {
                (Some(logo_line), Some(info_line)) => 
                    writeln!(f, "{}{}{:^}", logo_line, center_pad, info_line)?,
                (Some(logo_line), None) => 
                    writeln!(f, "{}", logo_line)?,
                (None, Some(info_line)) =>
                    writeln!(f, "{:<width$}{}{:^}", "", center_pad, info_line, width = logo_lines.width())?,
                (None, None) => { writeln!(f, "\n")?; break },
            }
        };

[andymac-2]

Oh whoops, that was definitely a victim of a large merge. Those commits occurred while I was moving things to different modules. As far as I can tell there are no other changes that were rolled back.

[o2sh]

No problem, merges are the worst.

Plz push the correction when possible.