Removed unused import.
Added Dialogs.java, which is a utility class for easy access to popup
windows.
Added a PAUSE boolean constant to pause the emulator (stops ticks).
Updated the MenuBar to include a pause menu, added mneunomics for the
headers, and accelerated strokes for the various menus.
Updated the about page to include a link to the github project.
Updated the MenuBar to include new mneumonics, etc.
Removed the information panel since emulator is running basically good
now.