DolphinQt: Rewrite About dialog to match the new DolphinWX one.

Source/Core/DolphinQt/Utils/Resources.cpp

@@ -55,6 +55,7 @@ void Resources::Init()
 
 	m_pixmaps.resize(NUM_ICONS);
 	m_pixmaps[DOLPHIN_LOGO].load(GIFN("Dolphin"));
+	m_pixmaps[DOLPHIN_LOGO_LARGE].load(GIFN("dolphin_logo"));
 	UpdatePixmaps();
 }
 

Source/Core/DolphinQt/Utils/Resources.h

@@ -41,6 +41,7 @@ public:
 		MEMCARD,
 		HOTKEYS,
 		DOLPHIN_LOGO,
+		DOLPHIN_LOGO_LARGE,
 		BANNER_MISSING,
 		NUM_ICONS
 	};