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/0039-Misc-Utils.patch

@@ -1,4 +1,4 @@
-From 80f595a006d469d8fe65d1324ee05d8b498a1ce5 Mon Sep 17 00:00:00 2001
+From a5a7153cde37ce84714514cd647693113fdea266 Mon Sep 17 00:00:00 2001
 From: vemacs <d@nkmem.es>
 Date: Wed, 23 Nov 2016 12:53:43 -0500
 Subject: [PATCH] Misc Utils
@@ -6,7 +6,7 @@ Subject: [PATCH] Misc Utils
 
 diff --git a/src/main/java/com/destroystokyo/paper/utils/CachedSizeConcurrentLinkedQueue.java b/src/main/java/com/destroystokyo/paper/utils/CachedSizeConcurrentLinkedQueue.java
 new file mode 100644
-index 0000000..d60ecbb
+index 00000000..d60ecbb1
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/utils/CachedSizeConcurrentLinkedQueue.java
 @@ -0,0 +1,31 @@
@@ -42,5 +42,5 @@ index 0000000..d60ecbb
 +    }
 +}
 -- 
-2.9.3
+2.12.2