update class ByteBuffer
new class
improve ByteBuffer
new class SegmentalByteBuffer
update todo
add new classes
update ByteBuffer
update SegmentalByteBuffer, it may will be discarded
update the http request/response representation system
update SegmentalByteBuffer, remove meaningless operator overloading
improve interface in HttpMessage
add new interface in HttpMessage
introduce the class HttpParser back, oh fuck...