Awkward

Through PR 11 (implemented `ListArray` and `ListOffsetArray`'s `__getitem__`).

Fix CMake version check again (for Linux2010).

Protect Linux2010 from visibility setting (which is intended for MacOS, anyway).

PR 8: C++ NumpyArray::getitem is done, setting the pattern for other classes (external C functions).

The Numba and Identity extensions are not done, which would be necessary to fully set the pattern.

Up through PR 4: `NumpyArray` and `ListOffsetArray` usable in C++, Python, and Numpy. C++ and Python have an `Identity` framework for particle kinematics (see [combinatorics language](https://github.com/jpivarski/PartiQL#readme)). The `dummy1` and `dummy3` functions tested in deployments 0.0.x have been removed (`Identity` has some real code in cpu-kernels).

Try to build MacOS 10.9+ images, rather than 10.13+.