Fix ChunkSender!

[VERBOSE] [Player$ChunkSender] send 556 chunk(s) to MikuMikuNi
Fixed as
[VERBOSE] [Player$ChunkSender] send 81 chunk(s) to MikuMikuNi
Revert distance based chunk sending
Add Chunk-Length to ConfigManager

+Fix NullPointer in First Launch
Add 'Status-dev' to Loader
Change HashMap in PlayerManager

to ConcurrentHashMap
Extract ChunkSender
Extract InternalDataPacketQueue