Create Calc.java

The calculator for the Photon Mint Programming Language.
This calculator is able to turn infix expressions:
"3 + 4 + (5 6) + 9(9) + 8^2"
Into prefix (logo and lisp) expressions:
"(+ 3 4 (* 5 6) (* 9 9) (^ 8 2))"
Alternatively:
"(+ 3 4 (* 5 6) (* 9 9) (square 8))"
And finally:
"+ 3 4 * 5 6 * 9 9 square 8"
Which is then evaluated recursively to give the correct answer.