Updated scene transition to use segues, passed game state using GameMode enum
now defined in GameKitHelper.swift (since it was already imported in both places)
rather than define a new header just for GameMode.
Added game mode label on GameVC to show state passed.
Removed now-unused methods.
Merge pull request #1 from codehearted/homeVC

Updated scene transition to use segues, passed game state using GameMode...