Add tunneling

[Killeroo]

Background: https://en.wikipedia.org/wiki/ICMP_tunnel UI: https://stackoverflow.com/a/7464499 Encryption: https://stackoverflow.com/a/10177020 https://www.codeproject.com/Articles/14150/Encrypt-and-Decrypt-Data-with-C

Different tunnel features:

• Simple UDP or TCP over ICMP
• Stagnography and packet spam while tunneling
• Simple messaging app