wave behavior and fixed explosion

managers/Wave/WaveContent.cs

@@ -0,0 +1,11 @@
+using Godot;
+
+namespace Movementtests.managers;
+
+[GlobalClass]
+public partial class WaveContent(SingleWave[] waves) : Resource
+{
+    [Export] public SingleWave[] Waves { get; set; } = waves;
+
+    public WaveContent() : this([]) {}
+}