Consider symbol table + scopes for name binding

[mighdoll]

The linker needs to match symbol references to symbol declarations. Currently it does this with a combination of resolveImport() and localRef().

Consider unifying the reference to declaration bindings with a scoped symbol tree approach, like esbuild describes. It might be cleaner, it'd likely be faster, and it'd more upgradable to future submodules/namespaces..

[mighdoll]

completed!