Added "favorites" and "last played" beatmap groups, and more sorts.

- New sorts: by date added, and most played.
- Sorts are moved to a dropdown menu.
- Tabs are now groupings (all songs, last played, favorites).
- Add/remove "favorite" beatmaps in the right-click menu.
- Beatmap database is now updateable like score database (no longer drops/recreates on every update).
- Various bug fixes.

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

src/itdelatrisu/opsu/ui/DropdownMenu.java

@@ -95,6 +95,9 @@ public class DropdownMenu<E> extends AbstractComponent {
 	/** The chevron images. */
 	private Image chevronDown, chevronRight;
 
+	/** Should the next click be blocked? */
+	private boolean blockClick = false;
+
 	/**
 	 * Creates a new dropdown menu.
 	 * @param container the container rendering this menu
@@ -327,6 +330,7 @@ public class DropdownMenu<E> extends AbstractComponent {
 		this.expanded = false;
 		this.lastUpdateTime = 0;
 		expandProgress.setTime(0);
+		blockClick = false;
 	}
 
 	@Override
@@ -349,9 +353,21 @@ public class DropdownMenu<E> extends AbstractComponent {
 			this.itemIndex = idx;
 			itemSelected(idx, items[idx]);
 		}
+		blockClick = true;
 		consumeEvent();
 	}
 
+	@Override
+	public void mouseClicked(int button, int x, int y, int clickCount) {
+		if (!active)
+			return;
+
+		if (blockClick) {
+			blockClick = false;
+			consumeEvent();
+		}
+	}
+
 	/**
 	 * Notification that a new item was selected (via override).
 	 * @param index the index of the item selected