Call System.gc() on track changes and game resets.

This causes a noticeable drop in memory usage in most cases.

Also renamed the "crash" popup since the game doesn't necessarily crash.

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

src/itdelatrisu/opsu/audio/MusicController.java

@@ -95,6 +95,7 @@ public class MusicController {
 
 			// releases all sources from previous tracks
 			destroyOpenAL();
+			System.gc();
 
 			switch (OsuParser.getExtension(osu.audioFilename.getName())) {
 			case "ogg":