CLI: TCPF: Development

Add 'send_queue' variable to the instance.
CLI: TCPF: Development

Prepare for trying the next theory: Instead of send and wait for
acknowledge, make the data queue to send. The data will come
to this queue and immediately sent to the socket. Once new DATA
frame will be received with the 'frames count received' field,
we will free that frames from the 'send_queue'. So, we will have
undelayed acknowledge mechanism similar to the sliding window
in TCP.

Define new constants and deactivate redundant code.