Add matrix generation functionality

[mcopik]

Implement module generating different types of matrices and specialize it for libraries if necessary. Randomized matrices are necessary for #3 . Add test for each type.

It seems that the best way for mixing should be to split properties into compile-time and runtime. At compile time we can specialize for shape and filling policies, a set of type properties can be analyzed at runtime to determine how to proceed with multiple properties.

Special matrices:

• zero
• identity

Fill policy:

• random
• constant value
• positive, negative

Types:

• SPD
• orthogonal, unitary, permutation
• Hermitian, normal