OnPrayerIcon changed and OnPlayerSkull changed events.

This needs 2 be tested

runelite-api/src/main/java/net/runelite/api/events/player/headicon/OverheadPrayerChanged.java

@@ -0,0 +1,21 @@
+package net.runelite.api.events.player.headicon;
+
+import lombok.Getter;
+import net.runelite.api.HeadIcon;
+import net.runelite.api.Player;
+
+public class OverheadPrayerChanged extends PlayerHeadIconChanged
+{
+	@Getter
+	private final HeadIcon oldHeadIcon;
+
+	@Getter
+	private final HeadIcon newHeadIcon;
+
+	public OverheadPrayerChanged(Player player, HeadIcon changedFrom, HeadIcon changedTo)
+	{
+		super(player);
+		this.oldHeadIcon = changedFrom;
+		this.newHeadIcon = changedTo;
+	}
+}

runelite-api/src/main/java/net/runelite/api/events/player/headicon/PlayerHeadIconChanged.java

@@ -0,0 +1,16 @@
+package net.runelite.api.events.player.headicon;
+
+import lombok.Getter;
+import net.runelite.api.Player;
+import net.runelite.api.events.Event;
+
+public abstract class PlayerHeadIconChanged implements Event
+{
+	@Getter
+	private final Player player;
+
+	public PlayerHeadIconChanged(Player player)
+	{
+		this.player = player;
+	}
+}

runelite-api/src/main/java/net/runelite/api/events/player/headicon/PlayerSkullChanged.java

@@ -0,0 +1,21 @@
+package net.runelite.api.events.player.headicon;
+
+import lombok.Getter;
+import net.runelite.api.Player;
+import net.runelite.api.SkullIcon;
+
+public class PlayerSkullChanged extends  PlayerHeadIconChanged
+{
+	@Getter
+	private final SkullIcon oldSkullIcon;
+
+	@Getter
+	private final SkullIcon newSkullIcon;
+
+	public PlayerSkullChanged(Player player, SkullIcon changedFrom, SkullIcon changedTo)
+	{
+		super(player);
+		this.oldSkullIcon = changedFrom;
+		this.newSkullIcon = changedTo;
+	}
+}