Development.txt - Supplement file for code documentation.
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Default android touch positions:

Use native width (w) as basic measurement, stretch in a ratio of 480/800,
put direction buttons and main control buttons in the lower corners,
a3 and a4 in center bottom, esc and start in upper corners and screenshot
center of the screen.

    start                       esc



            (screenshot)



                               special
 directions    a3   a4       a1       a2
                                jump