v4: integrate the new parser

[Alexandre Plateau]

WIP

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It has been decided to write a new parser for ArkScript v4 ; it should help with generating understandable error messages for the user, and reduce the maintenance cost.

The integration of this new parser should be done in multiple steps:

• the CI of the parser, I wish the keep the separate testing and fuzzing of the parser
• replacing the current lexer and parser
• implementing import resolving
  • update the examples, tests and standard library

[Alexandre Plateau]

Import syntax:

(import a)
(import a.b)  # everything is prefixed by b
(import foo.bar.egg)
(import foo:*)  # everything is imported in the current scope
(import foo.bar :a :b)  # we import only a and b from foo.bar, in the current scope

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I'm now thinking that we will need a special syntax for modules, which were imported like (import "foo.arkm"), however (import foo.arkm) won't work.

How about:

• (import module:foo) ; however it's a special syntax only for modules and looks a lot like (import foo.bar :egg)
• (import *foo*) ; another special syntax
• (import modules.foo), which might work if we put the standard library under lib. or std. ; instead of modules we could unify with lib/std but that might be conflicting and error inducing (hard to know what is a module and what isn't) ; but that poses the question: how do we, as a user, import our own module(s)?