Added scenario folder Worlds.ocf

We are starting to have too many settlement scenarios for one folder. This folder will contain all settlement scenarios with simple goals like mining, production or expansion. And these scenarios should all have dynamic maps and should be playable even after goal completion.

I will add the scenarios Gold Rush, Iron Peak and Conquest of Krakatoa and maybe other later, once I am done adjusting them.
Add new scenario Gem Grabbers to Worlds.ocf