* remove ≔ from the language and replace it by :=
* revert accidental changes in juvix input mode
* update stdlib submodule
* rename ℕ by Nat in the tests and examples
* fix shell tests
* Compute name dependency graph and filter unreachable declarations
* bugfix: recurse into type signatures
* positive tests
* make ormolu happy
* get starting nodes from ExportInfo
* make ormolu happy
* cosmetic refactoring of DependencyInfo
* fix tests & style