Add PrePlayerAttackEntityEvent (#8369)

Allows you to cancel player event attacking, preventing things like attack sounds from being played.

patches/api/Add-PrePlayerAttackEntityEvent.patch

@@ -0,0 +1,99 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Sun, 18 Sep 2022 13:10:28 -0400
+Subject: [PATCH] Add PrePlayerAttackEntityEvent
+
+
+diff --git a/src/main/java/io/papermc/paper/event/player/PrePlayerAttackEntityEvent.java b/src/main/java/io/papermc/paper/event/player/PrePlayerAttackEntityEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/event/player/PrePlayerAttackEntityEvent.java
+@@ -0,0 +0,0 @@
++package io.papermc.paper.event.player;
++
++import org.bukkit.entity.Entity;
++import org.bukkit.entity.Player;
++import org.bukkit.event.Cancellable;
++import org.bukkit.event.HandlerList;
++import org.bukkit.event.player.PlayerEvent;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * Called when the player tries to attack an entity.
++ *
++ * This occurs before any of the damage logic, so cancelling this event
++ * will prevent any sort of sounds from being played when attacking.
++ *
++ * This event will fire as cancelled for certain entities, with {@link PrePlayerAttackEntityEvent#willAttack()} being false
++ * to indicate that this entity will not actually be attacked.
++ * <p>
++ * Note: there may be other factors (invulnerability, etc) that will prevent this entity from being attacked that this event will not cover
++ */
++public class PrePlayerAttackEntityEvent extends PlayerEvent implements Cancellable {
++
++    private static final HandlerList HANDLER_LIST = new HandlerList();
++
++    @NotNull
++    private final Entity attacked;
++    private boolean cancelled;
++    private final boolean willAttack;
++
++    public PrePlayerAttackEntityEvent(@NotNull Player who, @NotNull Entity attacked, boolean willAttack) {
++        super(who);
++        this.attacked = attacked;
++        this.willAttack = willAttack;
++        this.cancelled = !willAttack;
++    }
++
++    /**
++     * Gets the entity that was attacked in this event.
++     * @return entity that was attacked
++     */
++    @NotNull
++    public Entity getAttacked() {
++        return this.attacked;
++    }
++
++    /**
++     * Gets if this entity will be attacked normally.
++     * Entities like falling sand will return false because
++     * their entity type does not allow them to be attacked.
++     * <p>
++     * Note: there may be other factors (invulnerability, etc) that will prevent this entity from being attacked that this event will not cover
++     * @return if the entity will actually be attacked
++     */
++    public boolean willAttack() {
++        return this.willAttack;
++    }
++
++    @NotNull
++    @Override
++    public HandlerList getHandlers() {
++        return HANDLER_LIST;
++    }
++
++    @NotNull
++    public static HandlerList getHandlerList() {
++        return HANDLER_LIST;
++    }
++
++    @Override
++    public boolean isCancelled() {
++        return this.cancelled;
++    }
++
++    /**
++     * Sets if this attack should be cancelled, note if {@link PrePlayerAttackEntityEvent#willAttack()} returns false
++     * this event will always be cancelled.
++     * @param cancel true if you wish to cancel this event
++     */
++    @Override
++    public void setCancelled(boolean cancel) {
++        if (!this.willAttack) {
++            return;
++        }
++
++        this.cancelled = cancel;
++    }
++}

patches/server/Add-PrePlayerAttackEntityEvent.patch

@@ -0,0 +1,30 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Sun, 18 Sep 2022 13:10:18 -0400
+Subject: [PATCH] Add PrePlayerAttackEntityEvent
+
+
+diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/entity/player/Player.java
++++ b/src/main/java/net/minecraft/world/entity/player/Player.java
+@@ -0,0 +0,0 @@ public abstract class Player extends LivingEntity {
+     }
+ 
+     public void attack(Entity target) {
+-        if (target.isAttackable()) {
+-            if (!target.skipAttackInteraction(this)) {
++        // Paper start - PlayerAttackEntityEvent
++        boolean willAttack = target.isAttackable() && !target.skipAttackInteraction(this); // Vanilla logic
++        io.papermc.paper.event.player.PrePlayerAttackEntityEvent playerAttackEntityEvent = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(
++            (org.bukkit.entity.Player) this.getBukkitEntity(),
++            target.getBukkitEntity(),
++            willAttack
++        );
++
++        if (playerAttackEntityEvent.callEvent() && willAttack) { // Logic moved to willAttack local variable.
++            {
++        // Paper end
+                 float f = (float) this.getAttributeValue(Attributes.ATTACK_DAMAGE);
+                 float f1;
+