Add day 6 solutions. Both, naive and more elaborate.

The naive implementation uses simple ring buffers and scales linearly
with the number of days needed.
The matrix based implementation uses matrix multiplication (implemented
in a brain-dead way inline here) and has the same scaling behaviour,
however implementing it showed that the matrix is correct.
The closed form is, well, a closed form based on the matrix based
solution, but working in the matrix' Eigenspace.

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