[Bleeding] Check that vanilla recipes actually exist. Fixes BUKKIT-5277

When falling back to vanilla recipes in the iteration of recipes,
a check is necessary to ensure that vanilla recipes are present.
RecipeIterator has been modified to account for the multi-map setup.
[Bleeding] Account for null in EntityDamageEvent handling. Fixes BUKKIT-5317

Damage caused by explosions will return null for the event as of
6588d6f72bbca74bf150de65593ac575b846111b. As such, a null check is
now necessary when handling non-living entity damage events.
 [Bleeding] Properly handle EntityBreakDoor event canceling. Fixes BUKKIT-5318

The method being called was renamed during the 1.4.2 update process
but the function call was not replaced accordingly, leading to a
missed diff from 314051580a0a8e4745d3a539f232b552916eb302.
Implement API for ServerListPingEvent. Adds BUKKIT-5121, BUKKIT-2465
Merge branch 'master' of git@github.com:Bukkit/CraftBukkit.git into allow-block-placement
Fix stacking for items after setting empty meta. Fixes BUKKIT-5331

ItemStacks do not stack if one has null for a tag, while the other has an
empty tag. In CraftItemStack, if you set an item to an empty ItemMeta, it
will create an empty tag for the internal ItemStack.

This changes the setItemMeta function to check for empty meta, and then
use null for the tag instead of an empty NBTTagCompound.
Readd connection throttle
Relocate NaN check on PacketPlayInFlying.
Add BlockPressurePlateWeighted.java for diff visibility
[Bleeding] Fire interact events for Weighted Pressure Plates. Fixes BUKKIT-5053

In 1.7, Minecraft changed Weighted Pressure Plates to allow players and
entities to interact with them, rather than simply changing redstone signal
based on the number of items on the pressure plate. This commit adds calls to
PlayerInteractEvent or EntityInteractEvent for every entity that steps on the
plate.
[Bleeding] Instantiate logger earlier in CraftServer. Fixes BUKKIT-4253.

Previously, if an error occurred during CraftServer initialization before the
logger was instantiated, it would cause an NPE and the server would never
finish loading properly. By instantiating the logger before attempting to
load anything else in CraftServer, we ensure that a logger will always be
available in the case of any errors.
[Bleeding] Add support for ThrownExpBottle and Fish to launchProjectile(...). Fixes BUKKIT-1536

Previously, trying to launch a ThrownExpBottle or Fish projectile would
result in an IllegalArgumentException. This commit adds support for both
ThrownExpBottle and Fish, which means that all current projectiles are
now properly supported by this method.
[Bleeding] Re-add EntityShootBowEvent lost in e93a3eb3b4c5234e3e3936bc697d566a42d3b30e. Fixes BUKKIT-4214

In the 1.2 update for CraftBukkit, a missed diff resulted in Skeletons no longer firing an EntityShootBowEvent when they shoot an arrow.
Add methods to get and set arrow knockback. Adds BUKKIT-5103
Add setCritical and isCritical methods to CraftArrow.java. Adds BUKKIT-5113
[Bleeding] Implement ProjectileSource API. Addresses BUKKIT-1038, BUKKIT-1156
[Bleeding] Implement setCharged and getCharged for WitherSkull. Addresses BUKKIT-3060
[Bleeding] Directly set direction in EntityFireball. Fixes BUKKIT-1154

Because EntityFireball.setDirection() adds a random offset to passed
parameters, it is not appropriate for use in an API method. As such,
the values need to be directly set to remain accurate.
[Bleeding] Use correct yaw and pitch when spawning arrows. Fixes BUKKIT-3320
[Bleeding] Fix support for several entities in World.spawn(). Fixes BUKKIT-3284