Add new map structures

[F1uctus]

• Rivers
• Lakes
• Mountains
• Caves

[F1uctus]

Map generation:

• I'm thinking about a good algorithm for creating noise.
  We can try Perlin noise first, crown already has noise implementation, but no demo.
  The relief is realistic, but boring. Perhaps, since we're using text graphics, this is not critical, but still.
• Mountains, lakes, etc.
• Set sea level.
• Rivers, from high places to low ones. A simple algorithm for flowing over the relief is needed.
• Think about the caves so that they are not affected by the sea level, and I have not thought about the generation itself yet.
• Place settlements based on relief, A* for roads (working on base-crown).
  Separate generator for settlements (side view). I think, we should be able to reuse the the base Map class.

[F1uctus]

Global map terrain generation logic is implemented here

RPGram/src/main/java/rpgram/maps/GlobalMap.java

Line 12 in e6857de

public GlobalMap(String name, int xSize, int ySize, int zSize) {

But for now it is just some random trees and buildings scattered on the map.
Some good algorithm for terrain and villages/towns generation is wanted.

To achieve this, crown's noise generation class refactoring may be needed also.
https://github.com/F1uctus/crown/blob/c34fa163be272c7ecedb5fa572a2fcf7f8b51f45/src/main/java/com/crown/maps/generation/Test.java#L8