Move files in preparation for monorepo migration

libs/theseus/src/util/mod.rs

@@ -0,0 +1,17 @@
+//! Theseus utility functions
+pub mod fetch;
+pub mod io;
+pub mod jre;
+pub mod platform;
+
+/// Wrap a builder which uses a mut reference into one which outputs an owned value
+macro_rules! wrap_ref_builder {
+    ($id:ident = $init:expr => $transform:block) => {{
+        let mut it = $init;
+        {
+            let $id = &mut it;
+            $transform;
+        }
+        it
+    }};
+}