XML documentation

Hey,

Added xml documentation + deleted unused usings for:
Champion
Game
Leauge
Misc

But most of my changes are aimed towards the api responses. I don't understand all your code (etc your timeconverter)  
Atleast the user doesn't really see it but it would be nice to have some documentation in those aswell.  

Ps: 
I'm still learning how to use this programn, if you have any tips about how to send better pull requests etc feel free to message me!

Regards,
Bert