clippy refactoring

src/lib.rs

@@ -1,5 +1,12 @@
 //! Rhai - embedded scripting for Rust
 
+// lints required by Rhai
+#![allow(unknown_lints,
+        type_complexity,
+        new_without_default_derive,
+        needless_pass_by_value,
+        too_many_arguments)]
+
 mod engine;
 mod fn_register;
 mod parser;