tkx11vnc wrt attaching to existing server in icon/tray mode.

-display console and check DISPLAY /tmp/...:0 on macosx.
implement -noxinerama.

ssvnc sync: connect_br.tcl socks4/5 http proxies, ss_vncviewer socks5 proxy. ssh 1st proxy. whatismyip.com fix. 127.0.0.1 on Darwin

We used to assume that a char[256] is properly aligned to be cast to
an rfbServerInitMsg, but that was not the case.  So use a union instead.

Noticed by Flavio Leitner.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

          Improvements to ss_vncviewer.  Automatically find X dpy and
          X login.  Reorganize menus a bit.  ~/.ssvncrc file.

          VNC redir.  -rawfb nullbig, randbig, solid, swirl, etc.
          FD_XDM mode to find_display.  -listdpy.  Add enlightenment.
          Xvnc.redirect FINDDISPLAY-vnc_redirect. -xvnc, -xvnc_redirect,
          -svc_xvnc. AUTO_PORT.

x11vnc: -autoport, -finddpy, -xdummy. watch xrandr events.  check_redir_services() utilities for Terminal services.  Improve Xdummy.

x11vnc: better -xkb tie-breaking for up keystrokes.  Add Xsrv/FD_XSRV custom server to FINDCREATEDISPLAY list.

x11vnc: improve FINDCREATEDISPLAY (-create) script, FD_GEOM, FD_SESS, FD_OPTS, FD_PROG env vars, add Xvnc support