Add characteristic polynomials whose solution will yield the eigenvectors of matrices.
Add cofactor matrix generation to parser
Add adjoint matrix generation to parser
Allow matrices to generate the characteristic polynomial whose solution yields the eigenvector of the matrix

This will also require introducing the following function definitions into the parser language:

For a matrix M,
cofactor(M) will yield the matrix of cofactors for M,
adjoint(M) will yield the adjoint of the matrix, M,
eigpoly(M) will yield the characteristic polynomial which when solved will yield the eigenvector of M