New clock - Black and white

Thanks again :) I was not aware of the "last" setting so thanks a lot! I already changed it and also refactored the code a bit (adding information should be easier now).

Regarding dependencies - I prefer to keep it optional i.e. I don't want that 2 other apps (weather + sched) are installed whenever the BW Clock is installed. I think it should be the decision of the user whether to use those features in combination with our BW clock or not - its totally fine to use "only" the clock in my opinion. For this reason, I decided to not add this to the metadata.json file..