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.
In most cases getBaseObject() is used with an exception handler which
only detects if it failed but not the reason. This modification allows
to use it without excess exception handlers.
Also add the same parameter to SketchBased::getVerifiedSketch().
The function getBaseShape() is removed and replaced with getBaseObject()
because it doesn't make a lot of scense: getBaseShape() masked the
base's class implementation (rather than redefine a virtual) which was
better in words of code reuse.
Also BaseFeature and Base properties relations are defined now in a
little another way.
