(HD) Create level

[luxkun]

Create a level in World.cs. A level should contain static trees and roads (what else?).

We also need to create a procedural code to spawn decorations, candies and phones (or not?)

[chirone0]

candies and phone pieces are randomly spawned (phone pieces in the Wells only). The roads are part of the BG, trees need to be drawn after the characters because they can walk behind them. Trees are drawn procedurally (not the position!) using different: Top, body, roots