Parser had only consturctor and parse functions public.
Likely, there would be just a creation of parser followed by .parse(),
and now this action is performed in `parse` function.
* Separation to two crates
- `ablescript`: library, language
- `ablescript_cli` - cli: repl and executor for files
* Added lints (back) to library
- unsafe_code and unwrap_used are forbidden
ondra05