change function signature sendall

[zwetan]

before

public function sendall( socket:int, bytes:ByteArray, flags:int = 0, buffer:uint = 0 ):int

after

public function sendall( socket:int, bytes:ByteArray, flags:int = 0, buffer:uint = 8192 ):Number

set the default buffer to 8192 bytes and return value to Number to support ByteArray max value of 4 GB

[zwetan]

done

sendall( socket:int, bytes:ByteArray, buffer:uint = 0, flags:int = 0 ):Number