Balancing Update

Balancing: -farming only on one tile is a bit boring so fertilizing has to be more expensive. fertilizing a plant now completely dries out the ground -getting millions of pumpkins meant that fertilizer was essentially free. pumpkins now only drop side length cubed pumpkins -really high drone speeds make it hard to actually see the execution of the programs which removes a lot of the satisfaction of the game. Drone speed new grows linearly with upgrades instead of exponentially -expressions that don't require the drone to do anything now execute 10 times faster -failed actions (like moving into a wall in the maze) now count as fast expressions that don't take the full execution time of an action -growing tons of mazes was a bit too cheap so mazes now only grow with a 10% chance after fertilizing instead of every time -unlock prices have been adjusted to the changes -grass can now be planted

New Content: -added polyculture -added yield upgrades -added a new unlock that allows trading several items at once -some more docs improvements

Fixes: -Items.Gold now gets unlocked properly -fixed locale bug that caused watering to break in Germany -fixed modifying lists in for loops -fixed list comparison