Add option to display all supported languages

[sharkdp]

Maybe:

> bat --list-languages
ActionScript			as
AppleScript				applescript
ASP						asa
Batch File				bat, cmd
C#						cs, csx
...

See: https://docs.rs/syntect/2.0.1/syntect/parsing/struct.SyntaxSet.html#method.syntaxes

[connorkuehl]

I'd like to work on this. I played around with it a little bit and I have the basic functionality working as described above.

./target/debug/bat.exe --help
bat 0.2.3
A cat(1) clone with wings.

USAGE:
    bat.exe [OPTIONS] [FILE]... [SUBCOMMAND]

OPTIONS:
---snipped---

        --list-languages
            Displays supported languages

--snipped--

Like this:

Batch File                      bat, cmd
NAnt Build File                 build
C#                      cs, csx
C++                     cpp, cc, cp, cxx, c++, C, h, hh, hpp, hxx, h++, inl, ipp
C                       c, h
CSS                     css, css.erb, css.liquid
Clojure                 clj
D                       d, di
Diff                    diff, patch

I'll need to work up something a bit more flexible if we want all the columns to line up correctly; some language names are very long/have a lot of extensions and this breaks out of the tabbed columns.

[sharkdp]

Cool, thank you very much! Getting the longest syntax name first should be fine. It's not like this has to be performance-optimized in any sense.

[sharkdp]

(also: bat works on Windows just like that? nice! 😄)

[connorkuehl]

Sounds good! I’ll check back in here if I have issues or with a PR once I’m done. I think the issues I had getting `bat` to work were not `bat`s fault so far. When building, you have to build from a x64 Developer Command Prompt (which is installed with Visual a studio/build tools) because `onig_sys` (which must be a dependency of one of `bat`s deps) ships a custom windows bat build script that uses tools that aren’t in the normal PATH. `bat`s config seems to use both `%APPDATA%\Roaming` and `%APPDATA%\Local` to draw on config files. Which is weird. Maybe one for themes and the other for syntax packages. I don’t exactly recall. I just created symlinks in both of those locations pointing to where I set up my `bat` config directories.

…

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