Xevious 1-4-84

This appears to be very close to the final version.  The only major issue (and it's a big one) is that the game crashes after reaching the second Nazca bird glyph for unknown reasons.  There is also some graphical garbage at the top of the status display box which would have needed to be fixed before release.  This bug dates all the way back to the 11/7/83 prototype but was never fixed.