Rework existing mapParts to feature more recognizable buildings and obstacles

[dsge]

Right now they feature unrecognizable obstacles.

We should change them to include:

• a bridge (no change necessary)
• an area with a small house in the middle of it
  • it should include a basic roof
  • it should have a basic door
• an area with a small pond in the middle of it
  • no need for it to actually feature water, a hole in the ground with a blue plane in it for "water" is good enough
  • it should have invisible walls on the edges of the "pond" so the player wouldn't be able to go into the "water"
• an area with a cave enterance in the middle of it
  • think something like this