First couple abilities implemented

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

@@ -0,0 +1,21 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+[Script(ScriptCategory.Ability, "aroma_veil")]
+public class AromaVeil : Script
+{
+    /// <inheritdoc />
+    public override void OnSwitchIn(IPokemon pokemon, byte position)
+    {
+        var side = pokemon.BattleData?.BattleSide;
+        var effect = side?.VolatileScripts.Add(new Side.AromaVeilEffect())?.Script as Side.AromaVeilEffect;
+        effect?.PlacerActivated(pokemon);
+    }
+
+    /// <inheritdoc />
+    public override void OnSwitchOut(IPokemon oldPokemon, byte position)
+    {
+        var side = oldPokemon.BattleData?.BattleSide;
+        var effect = side?.VolatileScripts.Get<Side.AromaVeilEffect>();
+        effect?.PlacerDeactivated(oldPokemon);
+    }
+}