* Add Placement::isSame() and expose to Python
* Add Placement::multRight/Placement::multLeft
* Fix PlacementPy::rotate
* Add Rotation::multRight/Rotation::multLeft
* Add a test feature FeatureTestPlacement for uni tests
* Add unit tests
Documentation for Placement.rotate() claims this function would be
compatible to TopoShape.rotate() which isn't exactly correct as the
generated placements differ because of backwards multiplication.
This commit adds a "comp" (as in "compatible") keyword argument that -
when "True" (default is False) - produces a Placement that is interchangable with the one
that is generated from TopoShape.rotate().
Convenience macros/function (in Interpreter.h)
* FC_PY_GetObject/Callable(), look for callables in a python object,
which will be used in future patch to improve performance in various
python observer/features.
* pyCall(WithKeywords)(), helper function to invoke the callable
Matrix4D:
* hasScale(), check if there is any scale in the transformation. If so,
further check if the scale is uniform or not. This will be used in
future patch for Part::TopoShape to decide which type of transform to
apply.
Placement:
* translate/rotate(), new convenience API
Rotation:
* isSame/multiVec(), new convenience API
Polygon2d:
* Intersect(), GetCenter(), new convenience API.
FlagToggler:
* New class for exception safe flag toggling, similar to StateLocker
but with template (actually, FlagToggler is added earlier by me).
BitsetLocker:
* New class for exception manipulation of a std::bitset variable.
