Add WindowsStore support
Merge in latest changes from craftworkgames
Merge branch 'master' of https://github.com/brainchest/CraftworkGames

Conflicts:
	Source/CraftworkGames.Gui/Controls/Button.cs
	Source/CraftworkGames.Gui/GuiInputManager.cs
	Source/CraftworkGames.GuiDemo.WindowsGL/Game1.cs