Major overhaul of java viewer.

Major overhaul of java viewer.

This is the first of several large commits intended to resolve a
number of problems and add new capabilities to the java viewer.
Among the most significant changes are a complete re-design of
the options dialog, which has been converted to a callback style
interface.  The look & feel of all dialogs are now similar to
the style of the native viewer now.  Also, the process by which
new viewers are spawned has changed and each viewer is a completely
separate process, allowing for runtime arguments to be handled
statically.