add game owner section in show view + helper

the show view logic is growing, which is (I think) inching more and
more towards a bad practice danger zone. I haven't quite figured out
what to do...but I'll need to figure it out soon.

I also think css/html compartmentalization will simplify a lot of it.
There can be a generic area where different partials will be served
depending on:

 - logged in have not joined
 - logged in and player
 - logged in and owner
 - not logged in