SIGMA 7
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Converted by Urusergi

J1 UP = Forward
J1 DOWN = Backward
J1 LEFT = Left
J1 RIGHT = Right
J1 B1 =  Fire

What have been done:
    - Wait for fire to skip title screen
    - Joypad control by default
    - Control choice menu removed
    - Highscore table: 'PLAYER 1' as default name if no input.
    - Screen one character moved to the right
    - Several texts improved ('best previous score'....., 'press any key to play', all the high scores)
    - The screen was compressed so I improved the decompressor at the same time I added the &bb18 sub-routine
    - Cheats for unlimited lives and time
