Function CheckMatrix

Checks if an array can be used as a matrix.

A matrix is a two-dimensional array (array of arrays), where all sub-arrays (rows) have the same length. This is an example matrix:

[
   [ 1, 1, 1, 1, 1, 1 ],
   [ 2, 0, 0, 0, 0, 4 ],
   [ 2, 0, 1, 2, 0, 4 ],
   [ 2, 0, 3, 4, 0, 4 ],
   [ 2, 0, 0, 0, 0, 4 ],
   [ 3, 3, 3, 3, 3, 3 ]
]
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