Initial convertion of a_Dt to std::chrono

also refactored cWorld::m_WorldAge and cWorld::m_TimeOfDay

src/Entities/Boat.cpp

@@ -91,7 +91,7 @@ void cBoat::OnRightClicked(cPlayer & a_Player)
 
 
 
-void cBoat::Tick(float a_Dt, cChunk & a_Chunk)
+void cBoat::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 {
 	super::Tick(a_Dt, a_Chunk);
 	BroadcastMovementUpdate();