First XI2 server implementation

[Simon Thum]

>> - While the protocol and the library support subpixels, the server doesn't
>> >   actually send them down the wire yet.
> 
> Any reason that scaled input devices can't do this? It seems like some
> fairly important new functionality that would be nice to see
> demonstrated.
> 
Attached is a patch which enables the axis remainder from relative
motion to be used*. This makes sense especially with adaptive
deceleration. Should be easy to adapt to rescaleValuatorAxis output
(more or less copy from accelPtrPredictable) so absolute is covered too.

One that's done one can fill a fp16.16 using axis and remainder. Note
the remainder is -0.5..0.5 ATM.

Cheers,

Simon


(*) Just ignore the deleted comment, rounding is covered
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