Merge branch 'enhanced_viewport_overlay-sx' into jgrpp

Conflicts:
	src/misc.cpp

src/misc.cpp

@@ -30,6 +30,7 @@
 #include "linkgraph/linkgraphschedule.h"
 #include "tracerestrict.h"
 #include "programmable_signals.h"
+#include "viewport_func.h"
 
 #include "safeguards.h"
 
@@ -61,6 +62,8 @@ void InitializeGame(uint size_x, uint size_y, bool reset_date, bool reset_settin
 
 	AllocateMap(size_x, size_y);
 
+	ViewportMapClearTunnelCache();
+
 	_pause_mode = PM_UNPAUSED;
 	_fast_forward = 0;
 	_tick_counter = 0;