More uniform binding of Numpy arrays (#381)

- Introduce a standard way to bind numpy arrays: py::array_t<T> and
.noconvert() on the argument
- Take py::array_t by value since it's just a small wrapper
- Update bindings

python/tests/test_ClusterVector.py

@@ -146,7 +146,7 @@ def test_masking_requires_c_contiguous_array():
     mask = np.array([True, False, True, False], dtype=bool)[::2]
     assert not mask.flags.c_contiguous
 
-    with pytest.raises(TypeError):
+    with pytest.raises(ValueError, match="C-contiguous"):
         cv(mask)