Removed overkill references to Players

Also removed setGame() from GameController
Added getCenterLocation() to BoardView

... for players to teleport to,
Fixed plugin.yml

Should have done this at commit 9dc12065a3b48db4f281cf4ff019b8f68914e1db
Fixed vertical boards

Should have done this at commit 56c3206610ac518e38603b8b4dea2d9c35e9d274