Eliminate variable::manager.

With the simplification of vconfig, this class no longer serves
a purpose.

src/game_events/handlers.cpp

@@ -330,7 +330,6 @@ void remove_event_handler(const std::string & id)
 
 
 manager::manager(const config& cfg)
-	: variable_manager()
 {
 	BOOST_FOREACH(const config &ev, cfg.child_range("event")) {
 		add_event_handler(ev);

src/game_events/handlers.hpp

@@ -25,7 +25,6 @@
 #define GAME_EVENTS_HANDLERS_H_INCLUDED
 
 #include "../config.hpp"
-#include "../variable.hpp"
 
 #include <boost/noncopyable.hpp>
 
@@ -84,9 +83,6 @@ namespace game_events
 		static void stop_buffering();
 		/// Commits the event handlers that were buffered.
 		static void commit_buffer();
-
-	private:
-		variable::manager variable_manager;
 	};
 
 	/// Create an event handler.

src/variable.cpp

@@ -358,13 +358,6 @@ vconfig::all_children_iterator vconfig::ordered_end() const
 	return all_children_iterator(cfg_->ordered_end(), cache_);
 }
 
-namespace variable
-{
-	manager::~manager()
-	{
-	}
-}
-
 scoped_wml_variable::scoped_wml_variable(const std::string& var_name) :
 	previous_val_(),
 	var_name_(var_name),

src/variable.hpp

@@ -22,7 +22,6 @@
 
 #include <utility>
 
-class game_state;
 class unit_map;
 
 /**
@@ -161,21 +160,6 @@ struct vconfig::all_children_iterator::pointer_proxy
 	const value_type *operator->() const { return &p; }
 };
 
-namespace variable
-{
-
-/**
- * Used to clear the cache for variables.
- */
-class manager
-{
-public:
-	~manager();
-};
-
-}
-
-
 
 class scoped_wml_variable
 {