/// surv_wavesystem 0/// A linear function of the number of players in the game:
/// zombiesInWave = surv_zombies_perplayer * numberOfPlayersInGame + surv_zombies_initial
/// z = a*p + b
/// Need to set: surv_zombies_perplayer, surv_zombies_initial
///
/// surv_wavesystem 1
/// A linear function of the wave number:
/// zombiesInWave = surv_zombies_perwave * waveNumber + surv_zombies_initial
/// z = c*w + b
/// Need to set: surv_zombies_perwave, surv_zombies_initial
///
/// surv_wavesystem 2
/// A composition of a linear function of the wave number and a linear function of the number of players in the game:
/// zombiesInWave = (waveNumber * surv_zombies_perwave + surv_zombies_perplayer) * numberOfPlayersInGame + surv_zombies_initial
/// z = (w*c+a)*p + b
/// Need to set: surv_zombies_perplayer, surv_zombies_perwave, surv_zombies_initial
///
/// surv_wavesystem 3
/// A linear combination of a function of the wave number and a function of the number of players in the game:
/// zombiesInWave = (surv_zombies_perwave * waveNumber) + (surv_zombies_perplayer * numberOfPlayersInGame) + surv_zombies_initial
/// z = (c*w) + (a*p) + b
/// Need to set: surv_zombies_perplayer, surv_zombies_perwave, surv_zombies_initial