Blender Git Loki

Add proportional editing presets to sculpt brushes

When sculpting, I always found that the behavior of the current curve
falloff system is not correct, so I added the same curves that
proportional editing uses to the brush falloff calculation. Now, curves
are easier to set up and they produce a much better result. You can
easily compare it against the old method by changing the curve preset
option from custom to smooth in the grab brush.

To make the new dam brush behave correctly, you need to select the
sharper curve preset. You can also use it to insert shapes using the
stroke anchored option and changing the curve preset.