Added directfs

Added a very rudimentary file I/O system suitable for experimenting
with the language further. A better one will be designed when we have
sensible error management.

src/pipeline/mod.rs

@@ -1,7 +1,6 @@
 //! Loading Orchid modules from source
 pub mod file_loader;
 mod import_abs_path;
-// mod import_resolution;
 mod dealias;
 mod parse_layer;
 mod project_tree;