+ add new VEINS_PER_BIOME Setting (Experimental) (see wiki for more information)
+ removed and combine some duplicate code

Side note: I got a lot of request to add the ability to control structures. And I now working on it. It will be an extra plugin since this is easier for me to maintenance it. I expect the first dev build to be available in 3 - 4 weeks, with the basic structure of the project and the first Structures to control. And than add step by step new Structures. The dev builds will be available on my discord server.