refactor!: renamed GameManager to Universe and HierarchyObject to UniverseObject

Engine.Core/UniverseTime.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Syntriax.Engine.Core;
+
+public readonly struct UniverseTime(TimeSpan TimeSinceStart, TimeSpan TimeDelta)
+{
+    public readonly TimeSpan TimeSinceStart = TimeSinceStart;
+    public readonly TimeSpan DeltaSpan = TimeDelta;
+
+    public readonly float DeltaTime = (float)TimeDelta.TotalSeconds;
+}