Clipping issue with different child stencils about axmol

[rh101]

I think this has something to do with the ProgramState being set on all child stencil nodes. They are all being set to the same ProgramState instance, but if this is changed to be a unique instance per child, then the problem is fixed, but memory usage goes up because of some other issue that I'm trying to track down.

[rh101]

Issue should now be fixed in PR #1957

The resulting output is now this:

To reproduce this output, then in addition to the cpp-tests changes mentioned in the initial post above, also change this line:
holesClipper->setStencil(_holesStencil);

to this:
holesClipper->setStencil(_holesStencil, true);