Third milestone:
- secure wiping function to survive compiler mayhem
- misc work to speed up building and for cleaner dependencies
- --offline now does not try to make DNS requests
- port bulletproofs from sarang's Java code
- switch from chacha8 to chacha20 for added security
- new fuzz tests
- fix peer list exchange between different node versions
- initial sync infinite loop fix
- code review and associated fixes
- update code now handles SSL and can do range requests
- multisig wallets now have (hexadecimal) seeds for save/restore
- fix deadlock with --max-concurrency 1
- build hardening
- fix DNSSEC checking with embedded unbound
- precompiled headers