add time delta context to scene

framework/common_components/src/mm/components/time_delta.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+namespace MM::Components {
+
+	// this is a context-variable / "component-singleton".
+	// it is used to retirve timing information about the tick.
+	// it is "read-only" for the systems and filled in by the service
+	// holding the scene.
+	struct TimeDelta {
+		float tickDelta = 1.f/60.f;
+
+		// this is optionally filled in
+		// it turned out, that sound playback needs the factor
+		float deltaFactor = 1.f;
+	};
+}
+