Blender Git Loki

Clay Strips: Input pressure curve and new defaults

By squaring the pen pressure and disabling BRUSH_SPACE_ATTEN the brush
feels like it has a bigger strength range, wich makes it easier to
control when applying less pressure in order to smooth sculpted
surfaces.

Each brush should have a custom input pressure curve by default to get
an optimal behaviour and make all brushes consistent, but that is going
to take some time to get it right.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6214