Implement native inventory manager workflows (#62)

crates/libremetaverse/src/lib.rs

@@ -15,6 +15,7 @@ mod download_manager;
 mod event_queue;
 mod gesture;
 mod inventory;
+mod inventory_manager;
 #[rustfmt::skip] // Deterministic machine output is formatted by the pinned generator.
 mod foliage_catalog;
 mod generated;