Btclib node

To test the code I was writing in btclib I wrote some logic to connect to bitcoin nodes with python. After a while I though I could use this foundation to start writing a very simple bitcoin node in python. I found out that none had done it before so I though I would give it a try.

Btclib_node is now hosted on github within the btclib organization

For now it has the following abilities:

• maintain a fully fledged connection with other bitcoin nodes
• relay transactions with a mempool
• sync headers
• download blocks
• very basic rpc api

However it still can't handle reorgs(ouch) and when it downloads blocks it doesn't perform any logic on it