[ci skip] Cleanup events (#10202)

patches/api/Add-WhitelistToggleEvent.patch

@@ -14,6 +14,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
++import org.jetbrains.annotations.ApiStatus;
 +import org.jetbrains.annotations.NotNull;
 +
 +/**
@@ -22,10 +23,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * @author Mark Vainomaa
 + */
 +public class WhitelistToggleEvent extends Event {
-+    private static final HandlerList handlers = new HandlerList();
 +
-+    private boolean enabled;
++    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
++    private final boolean enabled;
++
++    @ApiStatus.Internal
 +    public WhitelistToggleEvent(boolean enabled) {
 +        this.enabled = enabled;
 +    }
@@ -36,17 +39,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return Whether whitelist is going to be enabled or not
 +     */
 +    public boolean isEnabled() {
-+        return enabled;
++        return this.enabled;
 +    }
 +
 +    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
-+        return handlers;
++        return HANDLER_LIST;
 +    }
 +
 +    @NotNull
 +    public static HandlerList getHandlerList() {
-+        return handlers;
++        return HANDLER_LIST;
 +    }
 +}