redesigned lhnetaddress_t struct to be a generic container for sockaddr,

redesigned lhnetaddress_t struct to be a generic container for sockaddr,
this fixes runtime errors on FreeBSD where sockaddr_in does not match
the one that lhnet used to use
changed lhnetaddress_t struct to have a native port value rather than
having to poke at the sockaddr variants all the time to access port
values (now only a few places set/get the actual encoded port value)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@8460 d7cf8633-e32d-0410-b094-e92efae38249