DoctorDalek1963/lintrans

The save and load options in the file menu should be functional

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We should be able to save and load sessions. A session would consist of the matrix_wrapper object and the expression currently in the input box. A SaveObject would be created, pickled, and saved to a binary file. We could then load this binary save file at a different time.

This SaveObject would be a simple dataclass containing things like the current expression, matrix wrapper, and display settings.