Adds HealEachEndOfTurn effect, move common usings for scripts to separate file

pkmn_lib_interface/src/handling/mod.rs

@@ -14,6 +14,7 @@ pub use capabilities::*;
 #[cfg(not(feature = "mock_data"))]
 pub(crate) use cacheable::Cacheable;
 pub use script::Script;
+pub use script::ScriptOwner;
 
 #[repr(u8)]
 pub enum ScriptCategory {

pkmn_lib_interface/src/handling/script.rs

@@ -410,6 +410,7 @@ impl ScriptOwner {
                         Some(ScriptOwner::Battle(Rc::new(r.unwrap())))
                     }
                 }
+                3 => None,
                 _ => panic!("Unknown script owner kind: {}", kind),
             }
         }