Blood Moon Event

[thegamecracks]

Is your feature request related to a problem? Please describe.
To dynamically vary the difficulty, we could have zombie stats change periodically such as having increased movement speed, detection distance, and damage.

Describe the solution you'd like
A script could be added that on every third moon (or on random days), zombie stats are increased and a red post-processing filter is applied.

Additional context
Customization of these stats will require pruning through Zombies and Demons's source code. Additionally, the post-process filter should be designed correctly to handle Join-In-Progress players.