Standardize component dimensions for mesh arrays

Mesh arrays currently store the information for the feature to which the element normal points first, followed by the information for the other feature. This is true regardless of the component dimensions vector, but there is currently no reasonable standard for how that vector is constructed.

The component dimensions vector should have number of columns 1 larger than the original underlying array, with the last column containing the value 2 to explicitly define that two "objects" occupy that tuple.