Added undoable API

Issue #49 ServiceStateHandler

Merge branch 'stable' into master ...

# Conflicts:
# src/main/java/net/minecraft/world/WorldServer.java
# src/main/java/net/minecraft/world/chunk/Chunk.java

Fixed Entity & TileEntity unloading in worlds with 0 active chunks (memory leak on world generation)

Prevent teleportation while riding entity

[optim] Optimized Chunk.scheduleBlockUpdate() ...

- use ShortObjMap with chunk coord keys instead of HashSet<PendingBlockUpdate>
  - deduplicate PendingBlockUpdate by coord
  - pool ShortObjMap and TreeSet objects

Fixed player NBT data read/write out-of-sync ...

In ultramine core player data saves asynchronously, so it was possible to read OLD data after
NEW data requested to save, but has not really been written to the file.

Merge branch 'stable'

[compat] Fixed GalactiGreg ore generation

Merge branch 'stable' ...

# Conflicts:
#	build.gradle

Fixed /custmsg possible client crash

Fixed possible crashes caused by wrong eventProxy.startEntity(entity) placement

[optim] Optimized vanilla leaves decay

[optim] Totally replaced LongHashMap & IntHashMap implementation to Koloboke collections

Fixed strip color sequences from log file

Fixed /killentity

Fixed /vanish lang

Issue #47 Command unregister, fallback prefixes

Issue #50 Permissions moved out of the core

Issue #49 First service architecture draft

Issue #14 added WorldUpdateObject owner inference for pending updates and block events

[optim] ImportChunkLoader disposing ...

Now we don't wait for finishing of writing all worlds. Waiting only for current world, then closing region files. Currently implemented for ImportChunkLoader only, should be implemented for default chunk loader in future

Better hash for in-chunk block coords

Fixed 10bec8e13a PendingBlockUpdates and EntityFallingBlock processing after chunk populating

Revert "[optim] Entity.random replaced to ThreadLocalRandom (it's really faster)" ...

This reverts commit 3aa3ad9.
(Issues with some mods that uses random seed)

I18n for duration format & restart messages

Correct error-reporting on unknown WorldType and not equal generation settings in worlds.yml and level.dat

More appropriate behavior of not splitted world mode (splitWorldDirs: false)

[refactoring] typos in class names

[optim] Entity.random replaced to ThreadLocalRandom (it's really faster)