add reset_display function to manager, pump (allows late binding)

This makes it possible to move the game_events manager to the
game_state and construct it before the game_display.

src/game_events/manager.cpp

@@ -241,4 +241,10 @@ game_events::t_pump & manager::pump()
 	return *pump_;
 }
 
+void manager::reset_display(game_display * gd)
+{
+	resources_.screen = gd;
+	pump_->reset_display(gd);
+}
+
 } //end namespace game_events

src/game_events/manager.hpp

@@ -134,6 +134,8 @@ namespace game_events {
 		void write_events(config& cfg);
 
 		game_events::t_pump & pump();
+
+		void reset_display(game_display *);
 	};
 }
 

src/game_events/pump.cpp

@@ -609,6 +609,11 @@ size_t t_pump::wml_tracking()
 	return impl_->internal_wml_tracking;
 }
 
+void t_pump::reset_display(game_display * gd)
+{
+	impl_->resources.screen = gd;
+}
+
 t_pump::t_pump(manager & man, const t_context & res)
 	: impl_(new pump_impl(man, res))
 {}

src/game_events/pump.hpp

@@ -36,6 +36,7 @@
 #include<string>
 #include<sstream>
 
+class game_display;
 class vconfig;
 
 namespace lg { class logger; }
@@ -106,6 +107,8 @@ namespace game_events
 		 */
 		size_t wml_tracking();
 
+		void reset_display(game_display *);
+
 	private:
 		bool filter_event(const event_handler& handler, const queued_event& ev);