Resolve "Investigate extending pr0xy to use SAM"

In the end pr0xy was replaced by a small, asyncio application that receives the REDIRECTed (by iptables/netfilter) packets and creates client tunnels on i2p using SAM.

Unfortunately the I2P router has to run for some time before being able to connect to many destinations. It's recommended to test this locally by modifying FakeDns to include the <i2p host>:<fake ip address> mapping and using the iptables from contained/exec.sh. One has to REDIRECT traffic to the chosen fake IP towards the trans-proxy.

Closes #4 (closed)