Added the concept of an Explosive.

By: sunkid <sunkid@iminurnetz.com>

paper-api/src/main/java/org/bukkit/entity/Explosive.java

@@ -0,0 +1,30 @@
+package org.bukkit.entity;
+
+/**
+ * A representation of an explosive entity
+ */
+public interface Explosive extends Entity {
+    /**
+     * Set the radius affected by this explosive's explosion
+     * @param yield
+     */
+    public void setYield(float yield);
+
+    /**
+     * Return the radius or yield of this explosive's explosion
+     * @return the radius of blocks affected
+     */
+    public float getYield();
+
+    /**
+     * Set whether or not this explosive's explosion causes fire
+     * @param isIncendiary
+     */
+    public void setIsIncendiary(boolean isIncendiary);
+
+    /**
+     * Return whether or not this explosive creates a fire when exploding
+     * @return true if the explosive creates fire, false otherwise
+     */
+    public boolean isIncendiary();
+}