Standardize unimplemented API failures

crates/libremetaverse-lsl-tools/Cargo.toml

@@ -7,5 +7,8 @@ license.workspace = true
 repository.workspace = true
 description = "LSL parser-tool shims for the MetaCrate LibreMetaverse rewrite"
 
+[dependencies]
+libremetaverse-types = { path = "../libremetaverse-types" }
+
 [lints]
 workspace = true

crates/libremetaverse-lsl-tools/src/lib.rs

@@ -3,3 +3,4 @@
 mod generated;
 
 pub use generated::*;
+pub use libremetaverse_types::NotImplemented as Error;