Adding all Entities into CraftBukkit.

These are needed to properly allow for determining class type, in
accordance with current practice.

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

@@ -0,0 +1,191 @@
+package net.minecraft.server;
+
+import java.util.Random;
+
+public class EntityItem extends Entity {
+
+    public ItemStack a;
+    private int e;
+    public int b;
+    public int c;
+    private int f;
+    public float d;
+
+    public EntityItem(World world, double d1, double d2, double d3, ItemStack itemstack) {
+        super(world);
+        b = 0;
+        f = 5;
+        d = (float) (Math.random() * 3.1415926535897931D * 2D);
+        a(0.25F, 0.25F);
+        H = J / 2.0F;
+        a(d1, d2, d3);
+        a = itemstack;
+        v = (float) (Math.random() * 360D);
+        s = (float) (Math.random() * 0.20000000298023224D - 0.10000000149011612D);
+        t = 0.20000000298023224D;
+        u = (float) (Math.random() * 0.20000000298023224D - 0.10000000149011612D);
+        M = false;
+    }
+
+    public EntityItem(World world) {
+        super(world);
+        b = 0;
+        f = 5;
+        d = (float) (Math.random() * 3.1415926535897931D * 2D);
+        a(0.25F, 0.25F);
+        H = J / 2.0F;
+    }
+
+    protected void a() {}
+
+    public void b_() {
+        super.b_();
+        if (c > 0) {
+            c--;
+        }
+        m = p;
+        n = q;
+        o = r;
+        t -= 0.039999999105930328D;
+        if (l.c(MathHelper.b(p), MathHelper.b(q), MathHelper.b(r)) == Material.g) {
+            t = 0.20000000298023224D;
+            s = (W.nextFloat() - W.nextFloat()) * 0.2F;
+            u = (W.nextFloat() - W.nextFloat()) * 0.2F;
+            l.a(((Entity) (this)), "random.fizz", 0.4F, 2.0F + W.nextFloat() * 0.4F);
+        }
+        g(p, q, r);
+        c(s, t, u);
+        float f1 = 0.98F;
+
+        if (A) {
+            f1 = 0.5880001F;
+            int i = l.a(MathHelper.b(p), MathHelper.b(z.b) - 1, MathHelper.b(r));
+
+            if (i > 0) {
+                f1 = Block.m[i].bu * 0.98F;
+            }
+        }
+        s *= f1;
+        t *= 0.98000001907348633D;
+        u *= f1;
+        if (A) {
+            t *= -0.5D;
+        }
+        e++;
+        b++;
+        if (b >= 6000) {
+            q();
+        }
+    }
+
+    public boolean v() {
+        return l.a(z, Material.f, ((Entity) (this)));
+    }
+
+    private boolean g(double d1, double d2, double d3) {
+        int i = MathHelper.b(d1);
+        int j = MathHelper.b(d2);
+        int k = MathHelper.b(d3);
+        double d4 = d1 - (double) i;
+        double d5 = d2 - (double) j;
+        double d6 = d3 - (double) k;
+
+        if (Block.o[l.a(i, j, k)]) {
+            boolean flag = !Block.o[l.a(i - 1, j, k)];
+            boolean flag1 = !Block.o[l.a(i + 1, j, k)];
+            boolean flag2 = !Block.o[l.a(i, j - 1, k)];
+            boolean flag3 = !Block.o[l.a(i, j + 1, k)];
+            boolean flag4 = !Block.o[l.a(i, j, k - 1)];
+            boolean flag5 = !Block.o[l.a(i, j, k + 1)];
+            byte byte0 = -1;
+            double d7 = 9999D;
+
+            if (flag && d4 < d7) {
+                d7 = d4;
+                byte0 = 0;
+            }
+            if (flag1 && 1.0D - d4 < d7) {
+                d7 = 1.0D - d4;
+                byte0 = 1;
+            }
+            if (flag2 && d5 < d7) {
+                d7 = d5;
+                byte0 = 2;
+            }
+            if (flag3 && 1.0D - d5 < d7) {
+                d7 = 1.0D - d5;
+                byte0 = 3;
+            }
+            if (flag4 && d6 < d7) {
+                d7 = d6;
+                byte0 = 4;
+            }
+            if (flag5 && 1.0D - d6 < d7) {
+                double d8 = 1.0D - d6;
+
+                byte0 = 5;
+            }
+            float f1 = W.nextFloat() * 0.2F + 0.1F;
+
+            if (byte0 == 0) {
+                s = -f1;
+            }
+            if (byte0 == 1) {
+                s = f1;
+            }
+            if (byte0 == 2) {
+                t = -f1;
+            }
+            if (byte0 == 3) {
+                t = f1;
+            }
+            if (byte0 == 4) {
+                u = -f1;
+            }
+            if (byte0 == 5) {
+                u = f1;
+            }
+        }
+        return false;
+    }
+
+    protected void b(int i) {
+        a(((Entity) (null)), i);
+    }
+
+    public boolean a(Entity entity, int i) {
+        y();
+        f -= i;
+        if (f <= 0) {
+            q();
+        }
+        return false;
+    }
+
+    public void a(NBTTagCompound nbttagcompound) {
+        nbttagcompound.a("Health", (byte) f);
+        nbttagcompound.a("Age", (short) b);
+        nbttagcompound.a("Item", a.a(new NBTTagCompound()));
+    }
+
+    public void b(NBTTagCompound nbttagcompound) {
+        f = nbttagcompound.c("Health") & 0xff;
+        b = ((int) (nbttagcompound.c("Age")));
+        NBTTagCompound nbttagcompound1 = nbttagcompound.j("Item");
+
+        a = new ItemStack(nbttagcompound1);
+    }
+
+    public void b(EntityPlayer entityplayer) {
+        if (l.z) {
+            return;
+        }
+        int i = a.a;
+
+        if (c == 0 && entityplayer.an.a(a)) {
+            l.a(((Entity) (this)), "random.pop", 0.2F, ((W.nextFloat() - W.nextFloat()) * 0.7F + 1.0F) * 2.0F);
+            entityplayer.c(((Entity) (this)), i);
+            q();
+        }
+    }
+}