Remove the `GetObjective()` function from the `solution.Solution` Interface + Upgrade SymbolicMath.go version#28

kwesiRutledge merged 4 commits intomainMatProGo-dev/MatProInterface.go:mainfrom

kr/fix/remove-get-objective1MatProGo-dev/MatProInterface.go:kr/fix/remove-get-objective1Copy head branch name to clipboard