First couple abilities implemented

Plugins/PkmnLib.Plugin.Gen7/Scripts/Abilities/ArenaTrap.cs

@@ -0,0 +1,35 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+[Script(ScriptCategory.Ability, "arena_trap")]
+public class ArenaTrap : Script
+{
+    private IPokemon? _owner;
+
+    /// <inheritdoc />
+    public override void OnAddedToParent(IScriptSource source)
+    {
+        if (source is not IPokemon pokemon)
+            throw new InvalidOperationException("ArenaTrap can only be added to a Pokemon.");
+        _owner = pokemon;
+    }
+
+    /// <inheritdoc />
+    public override void PreventOpponentRunAway(IFleeChoice choice, ref bool prevent)
+    {
+        if (choice.User.IsFloating)
+            return;
+        if (_owner is not null)
+            choice.User.BattleData?.Battle.EventHook.Invoke(new AbilityTriggerEvent(_owner));
+        prevent = true;
+    }
+
+    /// <inheritdoc />
+    public override void PreventOpponentSwitch(ISwitchChoice choice, ref bool prevent)
+    {
+        if (choice.User.IsFloating)
+            return;
+        if (_owner is not null)
+            choice.User.BattleData?.Battle.EventHook.Invoke(new AbilityTriggerEvent(_owner));
+        prevent = true;
+    }
+}