Painting / Sculpting: more tweaks to pressure sensitivity

* Also do pressure interpolation for brush size and spacing.
* Do smoothing of pressure when smooth stroke and sample average is enabled.
* Revert the OS X specific pressure change to pressure ^ 2.5, for low pressure
  values like 0.05 it makes the pressure 100x lower, which is problematic. If
  we need to adjust the pressure curve it should be done for all platforms.

Still weak:

* Pressure of first touch on tablet is difficult to control, usually it's low
  which makes the stroke start out small or soft, but other times not. Finer
  event capturing at ghost level would help, along with pressure changes without
  mouse movement, but this may also need different paint stroke logic.
* Brush radius is rounded to integers, this gives noticeable stepping.
* Brush falloff is not antialiased, gives noticeable aliasing for small brush
  sizes which was always a problem, but is more common with size pressure control.

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