Features

• New entity: Hole (O), hinders all units, will be flooded if adjacent to water.
• New entity: Dirt (") ('), fills in a Hole, can be redug for free
• New entity: Rocks (") ('), hinders all units, may occasionally drop a Gold when dug
• New action: Press 'd', then a direction to Dig. This creates a Hole on Grass or Dirt, or fills in Rocks, Holes, and Water with Dirt.
• Dirt grows grass during Spring and Summer
• Rock fields spawn when the world starts
• Added a Stealth FOV - same as earlier memory FOV, but shows all non-Stealthy entities even if you can't see them.

Fixes

• Recalculate FOV when a Tree is cut down.