finally finish implementing SOCKS5 proxies in ecore-con.

finally finish implementing SOCKS5 proxies in ecore-con.
SOCKS5 is different from SOCKS4 in that it supports password authentication mechanisms (GSSAPI is still on the todo) and IPV6, neither of which are possible with SOCKS4

NOTE THAT THE CMDLINE SYNTAX FOR AUTOSOCKSING HAS CHANGED!
 *   ECORE_CON_SOCKS_V4=[user@]server-port:lookup
 *   ECORE_CON_SOCKS_V5=[user@]server-port:lookup

also note that I did not implement autosocksing with password. it's just not safe.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/ecore@67959 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33