fix client repeat-disconnect loop.
removed resolver from getifaddr dance (not reqd) and updated getifaddr code (needs windowz/linux testing).
don't accept new connections if listenport bind fails (possible due to OS firewall settings).
only use upnp w/ipv4 addresses.
re: disconnect loop. Looks like ethhost session isn't deallocating once stopped. Thinking UI might have shared_ptr. For now, letting dealloc/quit continue as long as isOpen returns false -- maybe okay since network will be halted. Also, it maybe possible the issue is due to network thread not running after disconnect so packets aren't tx/rx to kill peer -- either way, it's possible remote end doesn't ack disconnect and timeout/force-close-dealloc is required, so will need more attention later.
- Updated projects after all the re-potting.
- For simplicity, there's just one VS project for all the libethereum projects, however VS doesn't like duplicate source file names within the same project. To get around this I've created some "single compilation units" for some folders, these probably also compile faster than multiple files.
- Some 32bit only compile errors in RLP (cryptic template ambiguity) were resolved by explicitly invoking operator T() rather than doing a cast to T.
- Moved multiple implementations of toString(h256s const& _bs) into FixedHash.h
- Release shutdown deadlock problem is outstanding.