Research SV parser integration

[gasrodriguez]

We'll need a powerful enough SV parser to be able to index the project files in order to implement go to ref, find usages, autocomplation, refactor, hover and all those cool features. Ideally the integration with Go should be thin and not require a lot of coding, perhaps at the expense of performance. Alternatives to look are:

• using an AST dump from one of the parsers (requires the creation of structs and methods to walk the tree)
• creating a C api for some parser lib (not straightforward to wrap some classes that have to be extended from the Go code like listener/visitors, but may be possible setting callbacks)
• using SWIG to wrap the lib's classes directly

Options to look: slang, surelog, others (?