Re-implemented SSH tunneling features in Java viewer based on TurboVNC native client...

Re-implemented SSH tunneling features in Java viewer based on TurboVNC native client method.  Adds support for string substitutions of via command, as well as a '-tunnel' option for tunneling directly to VNC server host (also support string substitutions). This implementation requires the vncServerName to be the last argument specified to the viewer, however this is consistent with the behavior of the native client and does not appear to cause any problems when using the viewer in standalone, applet, or jnlp modes.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4910 3789f03b-4d11-0410-bbf8-ca57d06f2519