Made the impl_device macro more explicit about the implemented traits

This also converts impl_device into a procedural macro and get rid of a
lot of "magic" that was happening.

automation_lib/src/lib.rs

@@ -1,5 +1,4 @@
 #![allow(incomplete_features)]
-#![feature(specialization)]
 
 pub mod action_callback;
 pub mod config;
@@ -8,6 +7,7 @@ pub mod device_manager;
 pub mod error;
 pub mod event;
 pub mod helpers;
+pub mod lua;
 pub mod messages;
 pub mod mqtt;
 pub mod ntfy;