Move most cinematic path simulation data and control from the graphics class to the simulation component and solve the hash mimatch in non-visual replay.

Move graphics code to smaller helper functions UpdateSessionVisibility,
UpdateSilhouettesVisibility and DrawPaths.
Remove the hotkey TODO code which should be implemented differently.
Mark voids as const.

Differential Revision: https://code.wildfiregames.com/D271
Patch By: Vladislav
This was SVN commit r19375.

source/graphics/GameView.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2015 Wildfire Games.
+/* Copyright (C) 2017 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -626,11 +626,9 @@ void CGameView::Update(const float deltaRealTime)
 	if (!g_app_has_focus)
 		return;
 
-	if (m->CinemaManager.GetEnabled())
-	{
-		m->CinemaManager.Update(deltaRealTime);
+	m->CinemaManager.Update(deltaRealTime);
+	if (m->CinemaManager.IsEnabled())
 		return;
-	}
 
 	// Calculate mouse movement
 	static int mouse_last_x = 0;