Fixed long reading
Added empty classes (entity and tileentity)
Made region creation possible
-Chunk
--Removed LastSaveOn
--Renamed LastEditOn to LastUpdate (type long)
--Added entity and tileentity list fields
--Update heightmap before nbt writing
--Always write BlockLight and SkyLight
--Constrcutor for new chunks
--Dummy reading/writing entities and tileentities
--Fixed blockData reading
--Create biomeIds and heightMapData arrays if not found in nbt
-ChunkCache
--Add new chunks as last
-RegionFile
--Partially rewritten with LinkedList
--Return empty NBTReader on chunk request with no data
-ChunkManager
--Handle null value for chunk reader
-Level
--LastPlayed is given in milliseconds