feat: add line completed sound

src/main/java/eu/midnightdust/yaytris/game/Space.java

@@ -1,6 +1,7 @@
 package eu.midnightdust.yaytris.game;
 
 import eu.midnightdust.yaytris.Tetris;
+import eu.midnightdust.yaytris.util.SoundEffect;
 
 import java.awt.Color;
 import java.util.*;
@@ -76,6 +77,7 @@ public class Space {
                 combo *= completedLines.size();
             }
         }
+        if (!completedLines.isEmpty()) SoundEffect.LINE_COMPLETED.play();
         for (int completedIndex = 0; completedIndex < completedLines.size(); completedIndex++) { // Remove completed lines
             int line = completedLines.toArray(new Integer[0])[completedIndex];
             for (int i = line; i >= 0; i--) {