Several fixes and new api for experience merging/stacking (#9242)

patches/api/ExperienceOrb-merging-stacking-API.patch

@@ -1,12 +1,15 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Tue, 19 Dec 2017 22:56:24 -0500
-Subject: [PATCH] ExperienceOrbMergeEvent
+Subject: [PATCH] ExperienceOrb merging/stacking API
 
+Adds ExperienceOrbMergeEvent
 Fired when the server is about to merge 2 experience orbs
 Plugins can cancel this if they want to ensure experience orbs do not lose important
 metadata such as spawn reason, or conditionally move data from source to target.
 
+Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
+
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/ExperienceOrbMergeEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/ExperienceOrbMergeEvent.java
 new file mode 100644
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
@@ -104,3 +107,30 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return HANDLER_LIST;
 +    }
 +}
+diff --git a/src/main/java/org/bukkit/entity/ExperienceOrb.java b/src/main/java/org/bukkit/entity/ExperienceOrb.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/entity/ExperienceOrb.java
++++ b/src/main/java/org/bukkit/entity/ExperienceOrb.java
+@@ -0,0 +0,0 @@ public interface ExperienceOrb extends Entity {
+      * @param value Amount of experience
+      */
+     public void setExperience(int value);
++    
++    // Paper start - expose count
++    /**
++     * Get the stacked count for this experience orb.
++     *
++     * @return the count
++     */
++    int getCount();
++
++    /**
++     * Sets the stacked count for this experience orb.
++     *
++     * @param count the new count
++     */
++    void setCount(int count);
++    // Paper end
+ 
+     // Paper start
+     /**