Add EntityEquipment API. Adds BUKKIT-3103

Adds:
- Getting/Setting equipment
- getting/setting drop rates
- getting/setting ability to pick up items
-- As an added feature, players with this flag start off with a canceled PlayerPickupItemEvent

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

@@ -370,6 +370,7 @@ public class EntityArrow extends Entity implements IProjectile {
                 EntityItem item = new EntityItem(this.world, this.locX, this.locY, this.locZ, itemstack);
 
                 PlayerPickupItemEvent event = new PlayerPickupItemEvent((org.bukkit.entity.Player) entityhuman.getBukkitEntity(), new org.bukkit.craftbukkit.entity.CraftItem(this.world.getServer(), this, item), 0);
+                event.setCancelled(!entityhuman.canPickUpLoot);
                 this.world.getServer().getPluginManager().callEvent(event);
 
                 if (event.isCancelled()) {

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

@@ -204,6 +204,7 @@ public class EntityItem extends Entity {
             if (this.pickupDelay <= 0 && canHold > 0) {
                 this.itemStack.count = canHold;
                 PlayerPickupItemEvent event = new PlayerPickupItemEvent((org.bukkit.entity.Player) entityhuman.getBukkitEntity(), (org.bukkit.entity.Item) this.getBukkitEntity(), remaining);
+                event.setCancelled(!entityhuman.canPickUpLoot);
                 this.world.getServer().getPluginManager().callEvent(event);
                 this.itemStack.count = canHold + remaining;
 

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

@@ -82,11 +82,11 @@ public abstract class EntityLiving extends Entity {
     private ChunkCoordinates bP = new ChunkCoordinates(0, 0, 0);
     private float bQ = -1.0F;
     private ItemStack[] equipment = new ItemStack[5];
-    protected float[] dropChances = new float[5];
+    public float[] dropChances = new float[5]; // CraftBukkit - protected -> public
     private ItemStack[] bS = new ItemStack[5];
     public boolean bp = false;
     public int bq = 0;
-    protected boolean canPickUpLoot = false;
+    public boolean canPickUpLoot = false; // CraftBukkit - protected -> public
     public boolean persistent = !this.bj(); // CraftBukkit - private -> public, change value
     protected int bs;
     protected double bt;