Subtraction on-the-go Added

The buttons for subtracting 5 and 10 are added next to every character.
Now it is possible to subtract 5 and 10 from any character on the go.

TO_IMPLEMENT:
*Make -5 and -10 buttons invisible for the current character (you don't
need them there at the time)
*Animation (unroll, roll up, number negated floats up)
*Randomize the initiative for NPCs