replaced some self.add(key, value) as self[key] = value
Deletets unnecessery getters and setters

should clean the code a bit
changes .add() to [key] = value
Adds values() to cards
Cleans the content mess in Game.py
Replaces self.get_content() with self.values()in Groupcard
dictlike changes in Player.py
Dictlike changes in Frontent
Bugfixes
Removes old commented code
Adds list_groups()

this should be handled differently
Frontend should get the allowed actions and automaticly display them and give them a key
So definition of allowed acions is only needed once
atm actions have to be defined in Frontend and Turn (and partielly Game)
Bugfix
merged