Weather system

I added a weather system, a very simple Markov chain.  If you have ever been to the Salzkammergut, you know that weather changes frequently there and REALLY impacts your stay. Weather now can change between sunny, cloudy and rain and will influence what you can do that day. 

I also made a few tweaks here and there, for instance you now won't watch the same play in the theater twice in a row. Would be boring.