create a dependency graph for everything

[awestlake87]

instead of generating a module in the order it was declared, maybe the AST's job should be to construct a dependency graph. this will be crucial to resolving circular dependencies between modules, functions and data structures because hoist_* is confusing and not nearly flexible enough to handle these situations.

[awestlake87]

abandoned ast generation in favor of procedural hoisting, dependency generation, and code generation. It's ridiculous how easy it was to implement in comparison to using functions in the ast.

[awestlake87]

kinda hard to resolve, now that I think about it. continuing in #24