Store owning Horse in horse inventory. Fixes BUKKIT-4586
Restore CraftBukkit diff in ItemDye. Fixes BUKKIT-4493

Change ItemDye to pass the EntityHuman for StructureGrowEvent again.
Store item attributes. Addresses BUKKIT-4523
Fix NBT token for attribute names. Addresses BUKKIT-4483
Revert "Correct vehicle movement issues." Fixes BUKKIT-4565

This reverts commit 3d906d134417cfeefe7f71b916fee4d105e7650f.

Conflicts:
	src/main/java/net/minecraft/server/EntityTrackerEntry.java
POM Changes
mc-dev imports
Skeleton API Implementations
Spigot Configuration
Better Chunk Tick Selection
Crop Growth Rates
More Efficient Chunk Save Queue
More Efficient GetCubes
Proxy IP Filter
Merge tweaks and configuration

This allows the merging of Experience orbs, as well as the configuration of the merge radius of items. Additionally it refactors the merge algorithm to be a better experience for players.
LongHash Tweaks
Async Operation Catching

Catch and throw an exception when a potentially unsafe operation occurs on a thread other than the main server thread.
View Distance

This commit allows the user to select per world view distances, and view distances below 3. Be wary of the issues selecting a view distance of 1 or 2 may cause!
Compressed Nibble Arrays

Implement 'lightening' of NibbleArrays - only allocate
 buffers when non-trivial value Saving from 40-45% of memory use by chunk
 section data.

Finish up NibbleArray lightening work - use for Snapshots, reduce copies

Fix nibble handling with NBT - arrays aren't copied by NBTByteArray
Sync Free Chunk Reference Cache