Refactored background.tile.quantity into settings.background.tile.quantity
Refactored the stage module into the viewport module
Refactored background.tile.size() into util.calculate.tile.size()
Refactored Number.prototype.toCoord() into util.number.toCoord()
Refactored Number.prototype.fromCoord() into util.number.fromCoord()
Deprecate Array.prototype.last()