move bubble notification colors to Colors file

src/itdelatrisu/opsu/ui/Colors.java

@@ -49,6 +49,11 @@ public class Colors {
 		BLACK_BG_NORMAL = new Color(0, 0, 0, 0.25f),
 		BLACK_BG_HOVER  = new Color(0, 0, 0, 0.5f),
 		BLACK_BG_FOCUS  = new Color(0, 0, 0, 0.75f),
+		BUB_GREEN       = new Color(98, 131, 59),
+		BUB_WHITE       = new Color(220, 220, 220),
+		BUB_PURPLE      = new Color(94, 46, 149),
+		BUB_RED         = new Color(141, 49, 16),
+		BUB_ORANGE      = new Color(138, 72, 51),
 		GHOST_LOGO      = new Color(1.0f, 1.0f, 1.0f, 0.25f);
 
 	// This class should not be instantiated.