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-Server-Patches/Add-fromBottle-flag-to-Experience-Orbs.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Add fromBottle flag to Experience Orbs
 
 
 diff --git a/src/main/java/net/minecraft/server/EntityExperienceOrb.java b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
-index 14431b8ad..54c9200a9 100644
+index 14431b8a..54c9200a 100644
 --- a/src/main/java/net/minecraft/server/EntityExperienceOrb.java
 +++ b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
 @@ -0,0 +0,0 @@ public class EntityExperienceOrb extends Entity {
@@ -37,7 +37,7 @@ index 14431b8ad..54c9200a9 100644
          return false;
      }
 diff --git a/src/main/java/net/minecraft/server/EntityThrownExpBottle.java b/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
-index 0255986fd..289312950 100644
+index 0255986f..28931295 100644
 --- a/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
 +++ b/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
 @@ -0,0 +0,0 @@ public class EntityThrownExpBottle extends EntityProjectile {
@@ -50,7 +50,7 @@ index 0255986fd..289312950 100644
  
              this.die();
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
-index 3a09cab3d..61e3c6c3e 100644
+index 3a09cab3..61e3c6c3 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
 @@ -0,0 +0,0 @@ public class CraftExperienceOrb extends CraftEntity implements ExperienceOrb {