Kill ugly old getSecureRandom() and replace with simple wrapper for Windows CAPI and *nix /dev/urandom, and some build fixes.
Fix a Windows bug in refactored tap code, and always make sure we have a firewall exception rule on startup.
Some fixes to firewall config code.
(1) Tweak LAN locator beacon frequencies, (2) Windows virtual networks
now show up as *real* networks and prompt the user to set their
location and firewall status (public, private, home/work, etc.).

The hack used to achieve #2 should not be examined by children or those
suffering from epilepsy or heart conditions.