Coal mine production adjusts with player count

[Wunarg]

Exact new rate is: ((6 + count) + Maths::Max(0, count - 14)) * 0.05f reduces/increases material amounts generated does not change tickfrequency 0.35x previous at 1 player 0.5x previous at 4 players 1x at 14 players 2x at 24 players

[Wunarg]

Now balanced around 12 players for 1x, resulting in: 0.35x Previous rate at 1 player 0.5x at 4 players 1x at 12 players 2x at 22 players