Update.2 goal - game buttton orientation and rotate

[Mikus Grinbergs]

I have not been following the current status of "game button" 
support, but on the original G1G1 release the existing button 
definitions stayed in place when the display output was rotated.

Consensus had been deferred on which keys (and trackpad) should 
change orientation when the display output orientation changes. 
[See #5549, #2249. #1444, #808]


It would make the XO more user-friendly if when Update.2 is 
released, there is an easy-for-users-to-understand definition of how 
the buttons behave when the display output is rotated -- PLUS, for 
Update.2, Sugar and the Activities need to *follow* that definition.

["Waiting for X.future" should be a last resort, since in the 
meanwhile hand-held-mode users are left with an awkward XO.]


"Clearing up" game buttons should be a priority for Update.2

mikus