Add main theme music functionality; implement enable/disable scripts and audio resources

Scripts/DisableMainThemeMusic.cs

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+using Godot;
+
+namespace ParasiticGod.Scripts;
+
+public partial class DisableMainThemeMusic : Node
+{
+    public override void _Ready()
+    {
+        var mainThemeMusic = GetNodeOrNull<AudioStreamPlayer>("/root/MainThemeMusic");
+        mainThemeMusic?.Stop();
+    }
+}

Scripts/DisableMainThemeMusic.cs.uid

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+uid://bif3eyfa1lgl4

Scripts/EnableMainThemeMusic.cs

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+using Godot;
+
+namespace ParasiticGod.Scripts;
+
+public partial class EnableMainThemeMusic : Node
+{
+    public override void _Ready()
+    {
+        var mainThemeMusic = GetNodeOrNull<AudioStreamPlayer>("/root/MainThemeMusic");
+        if (mainThemeMusic is { Playing: false })
+        {
+            mainThemeMusic.Play();
+        }
+    }
+}

Scripts/EnableMainThemeMusic.cs.uid

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+uid://dvmrpbba7plsf