Fixes a bunch of clippy warnings, adds clippy to CI

src/dynamic_data/models/battle.rs

@@ -121,8 +121,8 @@ impl<'own, 'library> Battle<'own, 'library> {
     pub fn event_hook(&self) -> &EventHook {
         &self.event_hook
     }
-    pub fn history_holder(&self) -> &Box<HistoryHolder> {
-        &self.history_holder
+    pub fn history_holder(&self) -> &HistoryHolder {
+        self.history_holder.deref()
     }
     pub fn current_turn(&self) -> u32 {
         self.current_turn.load(Ordering::Relaxed)

src/dynamic_data/models/battle_side.rs

@@ -155,9 +155,9 @@ impl<'own, 'library> BattleSide<'own, 'library> {
             battle.event_hook().trigger(Event::Switch {
                 side_index: self.index,
                 index,
-                pokemon: Some(&pokemon),
+                pokemon: Some(pokemon),
             });
-            script_hook!(on_switch_in, pokemon, &pokemon);
+            script_hook!(on_switch_in, pokemon, pokemon);
         } else {
             self.battle().event_hook().trigger(Event::Switch {
                 side_index: self.index,