Feat/rref

[weiseng18]

Problem

Implement RREF functionality

Solution

• Create util that checks if RREF/REF/neither
• Create row operation methods
• Create method that does REF, returning the final matrix, and the steps taken (?)
• Create method that does the RREF, returning the final matrix, and the steps taken (?)
• Create frontend

Notes

Deciding whether to return steps taken for frontend to re-execute to generate the intermediate steps, or to return both the steps taken and intermediate matrices

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