Use Color class as data type for every other class member

[tobbi]

So, this might be the Vodka speaking but: I'm made from potatoes.

In any case, I just had this awesome idea the other day. We have this awesome versatile Color class in SuperTux that we don't use nearly often enough. We should definitely improve that. Instead of int: Use Color class.

Tilemap? Color class

Badguy? Color class

Color me surprised, but this way we save memory. What's the size of one instance of the Color class? 0.5 bits.

What's the size of one instance of the BadGuy class? 10↑↑↑↑↑↑3 bits (IDK what the data capacity of the known universe is but eeh, I think it's larger than that). In any case: Use Color class.