Support dependency management

[kwrooijen]

How is this managed in Arcadia? Do they have a :dependencies key in configuration.edn or do they use project.clj?

[selfsame]

Arcadia has a Leiningen style package manager that uses project.clj files (see https://github.com/arcadia-unity/Arcadia/blob/master/Source/arcadia/internal/packages.clj and https://github.com/arcadia-unity/Arcadia/blob/master/Source/arcadia/internal/leiningen.clj)

I would likely merge a PR that brought that into ArcadiaGodot but switched to a :deps key in configuration.edn AND that was relatively self contained in a single namespace