Better Goat$$ amount reading

[mattverley]

Currently the string representing the player's score (or amount of Goat$$) is quite raw with following digits in a difficult to read line. I propose the American way of delimiting groups of 3 numbers and a dot to mark the decimals: 1000 -> 1,000 1000000,50 -> 1,000,000.50

If it's too difficult to implement, I recommend at least the spacing of groups of 3 digits.

[YvesPhilippot]

Implemented, to test.

[YvesPhilippot]

Tested : OK