Game state bug fixes and better error handling.

Error handling (related to #53):
- Catch all exceptions caused by creating HitObjects and throw a more informative error with the hit object information. This also allows multiple errors to be reported, instead of crashing at the first error.
- Added a fallback "DummyObject" HitObject to replace hit objects causing errors, which should allow the game to function despite any errors.
- Added a toString() method to OsuHitObject (resembling the raw format).

Bug fixes (caused by #52):
- Game is no longer paused when focus is lost during lead-in time or during breaks.
- Replay frames are no longer recorded when the game is paused.
- Pulsing cursor animation now works even during lead-in time.
- skipIntro() during replays now works properly.

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

src/itdelatrisu/opsu/objects/DummyObject.java

@@ -0,0 +1,61 @@
+/*
+ * opsu! - an open-source osu! client
+ * Copyright (C) 2014, 2015 Jeffrey Han
+ *
+ * opsu! is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * opsu! is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with opsu!.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package itdelatrisu.opsu.objects;
+
+import itdelatrisu.opsu.OsuHitObject;
+
+import org.newdawn.slick.Graphics;
+
+/**
+ * Dummy hit object, used when another HitObject class cannot be created.
+ */
+public class DummyObject implements HitObject {
+	/** The associated OsuHitObject. */
+	private OsuHitObject hitObject;
+
+	/** The scaled starting x, y coordinates. */
+	private float x, y;
+
+	/**
+	 * Constructor.
+	 * @param hitObject the associated OsuHitObject
+	 */
+	public DummyObject(OsuHitObject hitObject) {
+		this.hitObject = hitObject;
+		this.x = hitObject.getScaledX();
+		this.y = hitObject.getScaledY();
+	}
+
+	@Override
+	public void draw(Graphics g, int trackPosition) {}
+
+	@Override
+	public boolean update(boolean overlap, int delta, int mouseX, int mouseY, boolean keyPressed, int trackPosition) {
+		return (trackPosition > hitObject.getTime());
+	}
+
+	@Override
+	public boolean mousePressed(int x, int y, int trackPosition) { return false; }
+
+	@Override
+	public float[] getPointAt(int trackPosition) { return new float[] { x, y }; }
+
+	@Override
+	public int getEndTime() { return hitObject.getTime(); }
+}