assembler: purge unwrap and use more AssembleErrors

assembler/src/lib.rs

@@ -1,3 +1,17 @@
+#![deny(
+    clippy::unwrap_used,
+    clippy::nursery,
+    clippy::perf,
+    clippy::pedantic,
+    clippy::complexity
+)]
+#![allow(
+    clippy::cast_possible_truncation,
+    clippy::missing_panics_doc,
+    clippy::missing_errors_doc,
+    clippy::match_wildcard_for_single_variants
+)]
+
 pub mod assembler;
 pub mod brainf;
 pub mod tooling;