Add a sunlight mechanic

With the daily cycle, the game is just begging for the inclusion of sunlight. This could range from a complex model where sunlight is modeled hourly, a simple check of whether a block is vertically covered, a model of viewshed obstruction, or set blocks to shade one horizontal for every three or four vertical.

Currently, you can cover your entire farmland with metal platforms and crops grow fine. That makes no sense. Reduce the growth rate of crops/trees under metal platforms or prevent them entirely.

Sunlight would also allow the balancing of crops and trees by shade tolerance and the inclusion of low-light crops (e.g., mushrooms). Pine trees could, for example, be more shade tolerant than maples, giving you a reason to grow them late game in shady areas.

While sun helps farms, shade could have the benefit of reducing evaporation or beaver thirst.

End result would be a more interesting and varied map that gives the player more strategic choices in using the landscape.

Thx!