Levels are stored as two files.

The level.tga file provides the tilemap for the starting layout. We use
two layers of pgu's tilemap - the tile layer, for the objects of interest,
and the code layer, which indicates the starting chicken positions.

The level.conf file allows the default game constants to be customised.

Example level.conf:

[Level]
Map: farm.tga
Goal: Survive
# -1 for unlimited
Turn limit: 14

[Game values]
Max Foxes: 10
Starting Cash: 100
Sell Price Egg: 10
Sell Price Chicken: 5
Sell Price Dead Fox: 5

[Fox probabilities]
Fox: 30
GreedyFox: 30
NinjaFox: 30
DemoFox: 9
Rinkhals: 1