Updates and fixes from fluddokt/opsu@76778f8 and fluddokt/opsu@cf321e9.

- Rotate slider ball image along the curve.
- Show download speed and time remaining when hovering over the download info button.
- Maintain aspect ratio of beatmap background image during gameplay.
- Clear beatmap background image cache after reaching OsuFile.MAX_CACHE_SIZE.
- Multiply hit circle size by OsuHitObject.getXMultiplier().
- Scale MENU_BUTTON_BG based on SongMenu.MAX_SONG_BUTTONS.
- Fixed download search TextField retaining focus even after leaving the downloads menu.
- Include Unicode title/artist strings in searches.
- Parse x,y beatmap coordinates as floats (instead of integers), and only read Kiai time if present.
- Added 1600x1200 resolution.

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

src/itdelatrisu/opsu/objects/Slider.java

@@ -99,7 +99,7 @@ public class Slider implements HitObject {
 	 */
 	public static void init(GameContainer container, float circleSize, OsuFile osu) {
 		int diameter = (int) (96 - (circleSize * 8));
-		diameter = diameter * container.getWidth() / 640;  // convert from Osupixels (640x480)
+		diameter = (int) (diameter * OsuHitObject.getXMultiplier());  // convert from Osupixels (640x480)
 
 		// slider ball
 		Image[] sliderBallImages;
@@ -211,9 +211,13 @@ public class Slider implements HitObject {
 			Utils.drawCentered(GameImage.APPROACHCIRCLE.getImage().getScaledCopy(approachScale), x, y, color);
 		} else {
 			float[] c = curve.pointAt(getT(trackPosition, false));
+			float[] c2 = curve.pointAt(getT(trackPosition, false) + 0.01f);
 
 			// slider ball
-			Utils.drawCentered(sliderBall, c[0], c[1]);
+			Image sliderBallFrame = sliderBall.getCurrentFrame();
+			float angle = (float) (Math.atan2(c2[1] - c[1], c2[0] - c[0]) * 180 / Math.PI);
+			sliderBallFrame.setRotation(angle);
+			sliderBallFrame.drawCentered(c[0], c[1]);
 
 			// follow circle
 			if (followCircleActive)