Use Init() for all screens, so we can set state before the base class

members are loaded--they'll see resets, score finalization, etc.  It
also results in smaller code, due to a g++ bug that causes constructors
to be emitted several times.

stepmania/src/ScreenSystemLayer.cpp

@@ -31,6 +31,12 @@
 //REGISTER_SCREEN_CLASS( ScreenSystemLayer );
 ScreenSystemLayer::ScreenSystemLayer() : Screen("ScreenSystemLayer")
 {
+}
+
+void ScreenSystemLayer::Init()
+{
+	Screen::Init();
+
 	this->AddChild(&m_textMessage);
 	this->AddChild(&m_textStats);
 	this->AddChild(&m_textTime);