Add animals to some worlds

[Sigra]

Some worlds do not have enough animals.

Winterland could have icebear and polar fox (white fur, small ears, see for example [http://www.fotosearch.com/photos-images/polar-fox.html]).

Desert could have camel, dromedar, desert fox (sand-coloured fur, big ears, see for example http://www.lepetitprince.net/sub_sabaku/fennec-fox_1.jpg).

Additional possibilities: mountain goat, giraffe, wildebeast, llama, kangaroo, crocodile, anaconda, bengal tiger, siberian tiger, elephant (Indian or African), hippo, rhino, blue whale, orca, marlin, flying fish, turkey, ostrich, jackal, cheetah, snakes, spiders, monitor lizard, kimodo dragon, jaguar, lion, dinosaurs?

[Sigra (sigra)]

And the wisent in winterland should be replaced with muskox.

[Alexia Death (alexiade)]

and blacklands could use a few snakes and spiders...

[SirVer (sirver)]

Setting to incomplete for bug sweeping.

[wl-zocker (wl-zocker)]

I think this would be a nice addition. How is this influenced by the one_world branch?
(This bug report did not expire because it is assigned to someone and it affects two projects.)

[SirVer (sirver)]

In the one_world branch all animals can be placed. Having more is always nice, but I do not think it is really necessary.

[SirVer (sirver)]

Setting to incomplete for bug sweeping.

[GunChleoc (gunchleoc)]

Migrated to https://github.com/widelands/widelands/issues/1737