Removed all explicit calls to clone and slightly modified matrix operations (due to the change mentioned above)
Added methods remove_row, remove_column, remove_last_row and remove_last_column + tests
Minor SquareMatrix refactor
Added matrix style in index.scss and removed html selector
Implemented "Add row" and "Add column" buttons for yew matrix component
Implemented iterator over every matrix element index pair (i, j) in method Matrix::indices
Removed redundat lifetime specifiers in some iterator methods
Implemented Add, AddAssign, Sub, SubAssign and Neg traits for Matrix
Added some tests for new functionality
Derived some traits for Matrix
Added panic when forming minor of a 2x2 matrix
Added row iteration and indexed (i, j) element iteration
Added more tests to Matrix