[PATCH] Add module-info to JMapViewer

[taylor.smock]

I'd like to add a module-info to JMapViewer before we do another release of it.

The patch does the following:

• Adds a module-info.java class that exports everything and requires java.desktop and java.logging.
• Modify the build.xml file to build the module-info.class file if built under Java 9. This does require two compile runs, so ant build takes a bit longer (2s). In order to get the second javac to work, I had to delete the compiled files (except for module-info.class). While I could technically just compile module-info by itself, that removes the compile-time sanity checks for modules.