Reorganize some of the unwieldly parts of the codebase

* Moved commands into their own folder to reduce `bin.rs`'s size
* Moved all of the VFS-related functionality into its own folder
* Documented a lot of functions, including a few very obscure ones

src/commands/init.rs

@@ -0,0 +1,16 @@
+use std::path::PathBuf;
+use std::process;
+
+use project::Project;
+
+pub fn init(project_path: &PathBuf) {
+    match Project::init(project_path) {
+        Ok(_) => {
+            println!("Created new empty project at {}", project_path.display());
+        },
+        Err(e) => {
+            eprintln!("Failed to create new project.\n{}", e);
+            process::exit(1);
+        },
+    }
+}