Remove Ignore invalid Marker Icon ID's in maps

Spigot has patched this issue inside MapIcon, meaning that we no longer need to maintain this patch; Spigots patch also fixes #668 in that it will verify the length of the array, as well as protect against a negative type value being fetched from the array. Only real change is that Spigots patch returns a MapIcon.Type.PLAYER, instead of the RED_MARKER as originally PR'd by Aikar.

Spigot-API-Patches/0035-Arrow-pickup-rule-API.patch

@@ -1,11 +1,11 @@
-From 17223e9ba60ecfb981e037bcc62018b428d71808 Mon Sep 17 00:00:00 2001
+From 5f3ad3c3d105730323ea950c36892c1c548f4437 Mon Sep 17 00:00:00 2001
 From: Jedediah Smith <jedediah@silencegreys.com>
 Date: Fri, 4 Mar 2016 03:13:18 -0500
 Subject: [PATCH] Arrow pickup rule API
 
 
 diff --git a/src/main/java/org/bukkit/entity/Arrow.java b/src/main/java/org/bukkit/entity/Arrow.java
-index 1ff0951..da4678d 100644
+index 1ff09518..da4678d0 100644
 --- a/src/main/java/org/bukkit/entity/Arrow.java
 +++ b/src/main/java/org/bukkit/entity/Arrow.java
 @@ -72,6 +72,40 @@ public interface Arrow extends Projectile {
@@ -50,5 +50,5 @@ index 1ff0951..da4678d 100644
      {
  
 -- 
-2.9.3
+2.12.2