Repurpose DressUp.SupportTransform property to define the following
behavior,
* When disabled (default), only the dressing will be used for patterning.
* When enabled, the additive/subtractive shape of the dressed base
feature will be used for patterning. Any dressing that is not applied
to the based feature will be ignored.
* If the dressing is applied to non-additive/subtractive feature, then
only the dressing will be used for patterning.
New API FreatureAddSub::getAddSubShape() is added to account for the
fact that a dressing (e.g. a fillet) can be either additive or
subtractive, which means that a DressUP feature may contain both
additive and subtractive shapes.
FeatureTransformed is modified to perform both fusion and cut if
required.
