Restored resources::units in a limited context

This is a partial revert of ed15163b95. Most place still use resources::gameboard->units(), but
they should still point to the same place.

This was done since the editor doesn't have a game_board and needs a way to specify a global unit_map.

src/editor/controller/editor_controller.cpp

@@ -160,6 +160,7 @@ void editor_controller::init_music(const config& game_config)
 
 editor_controller::~editor_controller()
 {
+	resources::units = nullptr;
 	resources::tod_manager = nullptr;
 	resources::gameboard = nullptr;
 

src/editor/map/context_manager.cpp

@@ -80,10 +80,10 @@ public:
 
 		// TODO register the tod_manager with the gui?
 		resources::tod_manager = context_manager_.get_map_context().get_time_manager();
+		resources::units = &context_manager_.get_map_context().get_units();
 
 		context_manager_.gui().replace_overlay_map(&context_manager_.get_map_context().get_overlays());
 
-
 		resources::classification = &context_manager_.get_map_context().get_classification();
 
 		context_manager_.gui().init_flags();

src/play_controller.cpp

@@ -125,6 +125,7 @@ static void clear_resources()
 	resources::tunnels = nullptr;
 	resources::undo_stack = nullptr;
 	resources::recorder = nullptr;
+	resources::units = nullptr;
 	resources::whiteboard.reset();
 	resources::classification = nullptr;
 }
@@ -212,6 +213,7 @@ void play_controller::init(CVideo& video, const config& level)
 		resources::gameboard = &gamestate().board_;
 		resources::gamedata = &gamestate().gamedata_;
 		resources::tod_manager = &gamestate().tod_manager_;
+		resources::units = &gamestate().board_.units_;
 		resources::filter_con = &gamestate();
 		resources::undo_stack = &undo_stack();
 		resources::game_events = gamestate().events_manager_.get();
@@ -295,6 +297,7 @@ void play_controller::reset_gamestate(const config& level, int replay_pos)
 	resources::gameboard = nullptr;
 	resources::gamedata = nullptr;
 	resources::tod_manager = nullptr;
+	resources::units = nullptr;
 	resources::filter_con = nullptr;
 	resources::lua_kernel = nullptr;
 	resources::game_events = nullptr;
@@ -307,6 +310,7 @@ void play_controller::reset_gamestate(const config& level, int replay_pos)
 	resources::gameboard = &gamestate().board_;
 	resources::gamedata = &gamestate().gamedata_;
 	resources::tod_manager = &gamestate().tod_manager_;
+	resources::units = &gamestate().board_.units_;
 	resources::filter_con = &gamestate();
 	resources::undo_stack = &undo_stack();
 	resources::game_events = gamestate().events_manager_.get();

src/resources.cpp

@@ -31,6 +31,7 @@ namespace resources
 	fake_unit_manager    *fake_units = nullptr;
 	pathfind::manager    *tunnels = nullptr;
 	actions::undo_list   *undo_stack = nullptr;
+	unit_map             *units = nullptr;
 	std::shared_ptr<wb::manager> whiteboard = std::shared_ptr<wb::manager>();
 	game_classification  *classification = nullptr;
 	bool                 simulation_ = false;

src/resources.hpp

@@ -28,6 +28,7 @@ class game_lua_kernel;
 class play_controller;
 class fake_unit_manager;
 class tod_manager;
+class unit_map;
 class persist_manager;
 class game_classification;
 struct mp_game_settings;
@@ -61,6 +62,7 @@ namespace resources
 	extern ::tod_manager          *tod_manager;
 	extern pathfind::manager      *tunnels;
 	extern actions::undo_list     *undo_stack;
+	extern unit_map               *units;
 	extern std::shared_ptr<wb::manager> whiteboard;
 	extern bool                   simulation_;
 }