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* added the trace function for a SquareMatrix * added Vector3.hat() and it's counterpart Dcm.vee() for skewsymskew symmetric matrix operations in relation to the cross product see https://en.wikipedia.org/wiki/Hat_operator * Matrix::write_string produced runtime errors when I used it in PX4 posix simulation, i simplified it * a Matrix3f is a SquareMatrix * added tests for SquareMatrix.trace, Vector3.hat and Dcm.vee * added a test for quaternion initialisation from array * preventing buffer overflows in Matrix.write_string method