Eliminates PlayerListFragment and negative button

The negative button wasn't going to ever do anything extra, so the
native back button fulfills that need.
From the reference for DialogFragment, it looks like an interface is not
the right way to do callbacks, so I changed the code to match the
reference material.
Matches onCreateDialog to reference material.

The way I was creating my dialog did not match the reference material. I
like this way of doing it more. I wonder if putting the "new" behind the
return reduces the amount of work that gets done.
Adds argument passing to PlayerFragmentList

A PlayerFragmentList is now created with an int of an id of a string
array used to set the items that get displayed.
Adds timer for how long the player has been in.

Timer starts when app starts and runs constantly. The timer restarts if
the button is clicked and then an item from the dialog list is clicked.