Created attacking sprites for the Melee Goblin

-Created the corresponding invincible version
-Changed the attack animation in MeleeEnemy.cs to use the new animation
Modified the third frame for the Goblin's Attacking animation and changed sky colors to be more accurate

-NOTE: There is currently an error in the fade time calculation that causes the fade to end too early on longer levels and end too late on shorter levels; fix this!
Finished Designing the HUD

-Used the final HUD mockup to finish designing the HUD on GamePage.xaml. Consumables and helpers are now accessible on the HUD
-As we create more helpers, more helper boxes will need to be added to the HUD. The template for a helper box has already been created
-Made TitleScreen.cs and OptionsScreen.cs scale according to the player's screen resolution and snap percent. OptionsScreen.cs needs a little more work on the snapping
-Added the void AddConsumableToHUD() method in Shop.cs for adding a consumable item to the HUD
-Created a general GridView XAML Style in App.xaml
-Created a GridView XAML Style for the consumables GridView in GamePage.xaml
Merge remote-tracking branch 'origin/FinalizeHUD' into AccurateSkyColors

Conflicts:
	Defend Your Castle/Defend Your Castle/Menus/TitleScreen.cs
Merge branch 'AccurateSkyColors'