Fixed the Game Over Screen Background

- Adjusted the margins on the background image so that it is not as big
- Set it to 100% opacity from 30% opacity
- Made the "Level Start" and the "Game Saved!" messages adjust based on screen size and resolution
Edited the Title Screen, Level, and Victory songs to loop much better

-Increased the decibel level of the Title Screen music by approximately 2.5db to make it louder
-Removed songs and XNB files that we are not using
Finished the How To Play Tutorial

- Added two new screens to the tutorial: Weapon Shortcuts (screen #4) and Ready to Play (screen #6)
- Increased the Height of the Exit button by adding Top and Bottom padding
- Set the max screen number to 6 in ScreenManager.cs so that the right arrow button would be hidden on the Ready to Play screen
- Created a method for resetting the How to Play screen, and reset the screen when the user clicks/taps on the Exit button
Created the Credits Screen

- Added a new screen in ScreenManager.cs: CreditsScreen
- Made the Victory and Title screen music play whenever the Credits Screen and the Title Screen, respectively, appear
- Added a Credits button to the Title Screen, which brings the player to the Credits Screen
- Disabled the Save button in the Shop after the player taps/clicks on it. It is then re-enabled 1 second later via a XAML animation
Adjusted the price of RepairWalls and the movement slow amount of Slowers

-Reduced the HealAmount of RepairWalls by 100, thus reducing the heal amount of RepairWallsx10 by 1000
-Reduced the initial movement speed slow from .5 to .4
-Reduced the slow amount increase each level from .5 to .4
  -At max level, the Slower now slows enemy movement speed by 1.2 instead of 1.5
Started Adding the Swipe Gesture to Switch Weapons

- Starting coding the functionality that would enable the player to switch weapons by swiping left or right while in-game. This is not done yet
- Added multi-touch support by adding the loop in Player.cs' Update method. The player can now kill Goblins with multiple fingers
- Disabled both Portrait orientations for the game. The game can now only be played in Landscape or LandscapeFlipped mode
- Added the IsScreenSwiped method to Input.cs. It is still a work in progress
Merge branch 'SlightBalancing' into AddSwipeToSwitchWeapons
Merge branch 'AddSwipeToSwitchWeapons'