Replace melody-* package with twig-lexer

[zackad]

@rellafella mention about twig-lexer that might be able to replace melody-* dependencies. If this could be implemented it might reduce complexity of the project and we no longer need to integrate melody-* package into this project directly.

Related:

• Integrate melody-* packages into this project directly #26

[zackad]

What we need is a parser, lexer is part of the parsing process. We still need to build AST ourself (assuming we drop melody-* packages). I think I'll go with original plan to merge melody-* packages directly into this project and gradually offload tokenizing process into external library if that will make it easier to manage.

[rellafella]

I haven't had a good amount of time to have a decent look at this. I think lets try and bundle those melody-* packages in and at least we are moving towards less unmaintained dependencies and hopefully can get a clearer picture into what is required.

[rellafella]

So it turns out a lot of the melody stuff, even though saved as .js files is actually written in typescript. Even through it would be great to have the whole repo in typescript I think the best way ahead would be to convert what we can to JSDoc as we integrate the packages into the core of this plugin.