MtMat: Add some functionality

[comments]
        - added ostream operator
        - added Det()
        - added GetMinor()

Signed-off-by: Nikola georgiev <georgiev.nikito@gmail.com>
MtMat: Added Invesrse() operation

Signed-off-by: Nikola georgiev <georgiev.nikito@gmail.com>
MtMat: Add multiply by vector(MtVec)

Signed-off-by: Nikola georgiev <georgiev.nikito@gmail.com>