DC++ 0.770

- [Launchpad bug 550300] Catch more potential file corruptions
- Fix socket resolve in *nix systems
- [ADC] NAT traversal to allow passive-passive connections
- Reduce donwload reconnect attempts after connection failures
- Fix crashes related to file lists
- [Launchpad bug 230973] Add MiniUPnPc for UPnP mappings and make it threaded
- Be stricter when parsing list-looking %[line:] params
- [Launchpad bug 326541] [ADC] Customizable search type extensions
- Update zlib to version 1.2.5
- Documentation and translations updated as usual, thanks everyone