Display time since achieving recent scores.

- Added history icon by Google: https://www.iconfinder.com/icons/326655/
- Draw history icon and elapsed time next to score buttons if they were achieved within 24 hours.  Conforming to osu! behavior, the elapsed time is not updated in real-time.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/GameImage.java

@@ -465,6 +465,12 @@ public enum GameImage {
 			return img.getScaledCopy((h * 0.15f) / img.getHeight());
 		}
 	},
+	HISTORY ("history", "png", false, false) {
+		@Override
+		protected Image process_sub(Image img, int w, int h) {
+			return img.getScaledCopy((h * 0.0278f) / img.getHeight());
+		}
+	},
 	REPOSITORY ("repo", "png", false, false) {
 		@Override
 		protected Image process_sub(Image img, int w, int h) {