Remove runtime check when constructing FunctionExpression, in order to
support future built-in function. Exception will be thrown when
evaluating the expression to inform user about the error.
mscale(matrix,vector|tuple) for scaling matrix
minvert(matrix|placement|rotation) for inverting matrix, placement or
rotation
create(type,arg...) for creating Python object of given type (currently
only support 'matrix', 'placement', 'rotation', 'vector'
* Support sub-object reference syntax using the following syntax,
Part.<<Box.>>.Placement
or, with sub-object label referencing
Part.<<$Cube.>>.Placement
* Extend indexing support, including range based indexing, e.g.
A1[B2+1][C3][D4:-1]
* Add new constants, None, True, true, False, false.
