fix: reduce volume and overmodulation of main theme (#4298)

* fix: reduce volume and overmodulation of main theme
* feat: use 0.5 as default music volume
* chore: remove deprecated audio settings from default.cfg
* fix: use lower quality level to reduce file size

Author: jdrueckert

engine/src/main/java/org/terasology/config/AudioConfig.java

@@ -35,7 +35,7 @@ public class AudioConfig extends AutoConfig {
     public final Setting<Float> musicVolume =
         setting(
             type(Float.class),
-            defaultValue(1.0f),
+            defaultValue(0.5f),
             constraint(new NumberRangeConstraint<>(0.0f, 1.0f, true, true))
         );
 

engine/src/main/resources/assets/music/MenuTheme.ogg

@@ -13,11 +13,6 @@
     "mouseSensitivity": 0.25,
     "mouseYAxisInverted": false
   },
-  "audio": {
-    "soundVolume": 1.0,
-    "musicVolume": 0.1,
-    "disableSound": false
-  },
   "rendering": {
     "pixelFormat": 24,
     "windowPosX": 379,