Huge refactor. Introduce anyhow for error handling.

imports_order.rs

@@ -0,0 +1,17 @@
+// Acknowledge sister/child
+mod module;
+
+// std
+use std::*;
+
+// sister/child
+use module1::*;
+
+// parent
+use super::*;
+
+// ancestor of parent
+use crate::*;
+
+// external
+use external::*;