[Bleeding] MaterialData fixes. Addresses BUKKIT-842

By: Celtic Minstrel <celtic.minstrel.ca@some.place>

paper-api/src/main/java/org/bukkit/material/SpawnEgg.java

@@ -0,0 +1,52 @@
+package org.bukkit.material;
+
+import org.bukkit.Material;
+import org.bukkit.entity.EntityType;
+
+/**
+ * Represents a spawn egg that can be used to spawn mobs
+ */
+public class SpawnEgg extends MaterialData {
+    public SpawnEgg() {
+        super(Material.MONSTER_EGG);
+    }
+
+    public SpawnEgg(int type, byte data){
+        super(type, data);
+    }
+
+    public SpawnEgg(byte data) {
+        super(Material.MONSTER_EGG, data);
+    }
+
+    public SpawnEgg(EntityType type) {
+        this();
+        setSpawnedType(type);
+    }
+
+    /**
+     * Get the type of entity this egg will spawn.
+     * @return The entity type.
+     */
+    public EntityType getSpawnedType() {
+        return EntityType.fromId(getData());
+    }
+
+    /**
+     * Set the type of entity this egg will spawn.
+     * @param type The entity type.
+     */
+    public void setSpawnedType(EntityType type) {
+        setData((byte) type.getTypeId());
+    }
+
+    @Override
+    public String toString() {
+        return "SPAWN EGG{" + getSpawnedType() + "}";
+    }
+
+    @Override
+    public SpawnEgg clone() {
+        return (SpawnEgg) super.clone();
+    }
+}