Fix further clippy lints

... and explicitly annotate crates as well.

src/lib.rs

@@ -174,12 +174,20 @@
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/iced-rs/iced/9ab6923e943f784985e9ef9ca28b10278297225d/docs/logo.svg"
 )]
-#![deny(missing_docs)]
-#![deny(missing_debug_implementations)]
-#![deny(unused_results)]
-#![forbid(unsafe_code)]
-#![forbid(rust_2018_idioms)]
+#![deny(
+    missing_debug_implementations,
+    missing_docs,
+    unused_results,
+    clippy::extra_unused_lifetimes,
+    clippy::from_over_into,
+    clippy::needless_borrow,
+    clippy::new_without_default,
+    clippy::useless_conversion
+)]
+#![forbid(rust_2018_idioms, unsafe_code)]
+#![allow(clippy::inherent_to_string, clippy::type_complexity)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
+
 mod element;
 mod error;
 mod result;