[Bf-committers] sculpt ready for beta release

[Tom M]

Sculpt branch is ready for the beta release, sorry for the last minute
churnning, getting sane defaults that everyone was happy with was
harder than expected.

The icons for the texture paint, vertex paint and weight paint are
place holder icons so that blank squares aren't used for the beta.

the front faces only option we've decided to disable by default since
when strength is high and a stroke is fast it gives odd results for
the draw related brushes.  It is still very useful when working on
thin objects and when working with flatten and other planar brushes
working near a crease/edge so it is kept available in the interface,
just not enabled by default.  (A better version that can be enabled
all the time is being considered which would calculate the facing
based on what the angle was at the start of the stroke using the
original data, instead of what the face angle is during the stroke
after a daub has already been applied).