More work on WASM handling.

src/dynamic_data/event_hooks.rs

@@ -91,6 +91,15 @@ pub enum Event<'own, 'battle, 'library> {
         /// The health of the Pokemon after the damage.
         new_health: u32,
     },
+    /// This event happens when a Pokemon gets healed
+    Heal {
+        /// The Pokemon that gets healed.
+        pokemon: &'own Pokemon<'battle, 'library>,
+        /// The health of the Pokemon before the heal.
+        original_health: u32,
+        /// The health of the Pokemon after the heal.
+        new_health: u32,
+    },
     /// This event happens when a Pokemon faints.
     Faint {
         /// The pokemon that has fainted.