make whiteboard a shared_pointer in resources

This makes subsequent commit easier, because lua wants to be able
to make reports, and therefore needs a report_context

src/play_controller.cpp

@@ -84,7 +84,7 @@ static void clear_resources()
 	resources::tunnels = NULL;
 	resources::undo_stack = NULL;
 	resources::units = NULL;
-	resources::whiteboard = NULL;
+	resources::whiteboard.reset();
 
 
 	resources::classification = NULL;
@@ -259,7 +259,7 @@ void play_controller::init(CVideo& video){
 	pathfind_manager_.reset(new pathfind::manager(level_));
 	whiteboard_manager_.reset(new wb::manager());
 	resources::tunnels = pathfind_manager_.get();
-	resources::whiteboard = whiteboard_manager_.get();
+	resources::whiteboard = whiteboard_manager_;
 
 	LOG_NG << "building terrain rules... " << (SDL_GetTicks() - ticks_) << std::endl;
 	loadscreen::start_stage("build terrain");

src/resources.cpp

@@ -31,7 +31,7 @@ namespace resources
 	pathfind::manager    *tunnels = NULL;
 	actions::undo_list   *undo_stack = NULL;
 	unit_map             *units = NULL;
-	wb::manager          *whiteboard = NULL;
+	boost::shared_ptr<wb::manager> whiteboard = boost::shared_ptr<wb::manager>();
 	game_classification  *classification = NULL;
 	const mp_game_settings *mp_settings = NULL;
 }

src/resources.hpp

@@ -16,6 +16,7 @@
 #define RESOURCES_H_
 
 #include <vector>
+#include <boost/shared_ptr.hpp>
 
 class game_board;
 class game_config_manager;
@@ -57,7 +58,7 @@ namespace resources
 	extern pathfind::manager      *tunnels;
 	extern actions::undo_list     *undo_stack;
 	extern unit_map               *units;
-	extern wb::manager            *whiteboard;
+	extern boost::shared_ptr<wb::manager> whiteboard;
 }
 
 #endif