Completed the "ScenarioViewController" merging

[identity2]

Major Changes

• Merged all the Choices-xScenes and Scene-xs VCs into a single ScenarioViewController.
• Restructured the SQLite database, so that the current 2 scenarios could be stored together.
• Redesigned segues between each VC.

Minor Changes

• Kept the Choice Buttons in an (@IBOutlet) Array<UIButton>! instead of individual UIButton!s.
• Replaced all of the UITextFields and UITextViews with UILabels, since no text input and text scrolling is required.
• Renamed classes, variables and added comments to improve readability.
• Added a placeholder VC for mini games.

Below is a picture for the newly designed Storyboard. (However, the "Customize Avatar" and "Shop" are not implemented yet.)

[sunjunkie]

This is merged. However the error conditions need to be handled (replace print statements) in a future merge.