Add EntitySmallFireball.java from nms

src/main/java/net/minecraft/server/EntitySmallFireball.java

@@ -0,0 +1,67 @@
+package net.minecraft.server;
+
+public class EntitySmallFireball extends EntityFireball {
+
+    public EntitySmallFireball(World world) {
+        super(world);
+        this.b(0.3125F, 0.3125F);
+    }
+
+    public EntitySmallFireball(World world, EntityLiving entityliving, double d0, double d1, double d2) {
+        super(world, entityliving, d0, d1, d2);
+        this.b(0.3125F, 0.3125F);
+    }
+
+    protected void a(MovingObjectPosition movingobjectposition) {
+        if (!this.world.isStatic) {
+            if (movingobjectposition.entity != null) {
+                if (!movingobjectposition.entity.ax() && movingobjectposition.entity.damageEntity(DamageSource.fireball(this, this.shooter), 5)) {
+                    movingobjectposition.entity.j(5);
+                }
+            } else {
+                int i = movingobjectposition.b;
+                int j = movingobjectposition.c;
+                int k = movingobjectposition.d;
+
+                switch (movingobjectposition.face) {
+                case 0:
+                    --j;
+                    break;
+
+                case 1:
+                    ++j;
+                    break;
+
+                case 2:
+                    --k;
+                    break;
+
+                case 3:
+                    ++k;
+                    break;
+
+                case 4:
+                    --i;
+                    break;
+
+                case 5:
+                    ++i;
+                }
+
+                if (this.world.isEmpty(i, j, k)) {
+                    this.world.setTypeId(i, j, k, Block.FIRE.id);
+                }
+            }
+
+            this.die();
+        }
+    }
+
+    public boolean e_() {
+        return false;
+    }
+
+    public boolean damageEntity(DamageSource damagesource, int i) {
+        return false;
+    }
+}