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Add support for custom pointer acceleration

Merged Add support for custom pointer acceleration
Yinon/xf86-input-libinput:custom-acceleration into master
Merged Yinon Burgansky requested to merge Yinon/xf86-input-libinput:custom-acceleration into master
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  • 062da300 
    `AccelProfile` option can now accept `custom` value.

Add 4 new options which only apply when `AccelProfile` is `custom`:

- Add `AccelPointsFallback` option for setting the points of the
  Fallback acceleration function. Points values are represented by a
  space-separated list, e.g. "0.0 1.0 2.4 2.5".

- Add `AccelStepFallback` Option for setting the step of the Fallback
  acceleration function. When a step of 0.0 is provided,
  libinput default Fallback acceleration function is used.

- Add `AccelPointsMotion` and `AccelStepMotion` options, which are
  equivalent to `AccelPointsFallback` and `AccelStepFallback` options,
  but apply to the Motion acceleration function.

See libinput documentation for a detailed explanation of custom
pointer acceleration.