view states are now managed by a stack + bugfixing

- when one defines DECL_ENUM_LAST it is possible to check whether a string for
	a give enum exists
- making sure ships are alive when they are spawned
- added warning concerning QueueEvent and TriggerEvent (one shall avoid the
	latter)

asteroids/Model.h

@@ -10,16 +10,22 @@ class Model : public Engine::ModelBase {
 	public:
 		virtual ~Model() {};
 		virtual void Process();
-		int DoLoadLevel (const char* filename);
-		int DoSaveLevel (const char* filename);
+		virtual void SetGameState (const unsigned int &state);
+		float GetWorldWidth ();
+		float GetWorldHeight ();
+
+		/* Event handler */
 		bool OnLevelComplete();
 		bool OnGameOver();
 		/** \brief Resets values from a previous game */
 		void OnNewGame ();
 		void OnShipExplode ();
 
-		virtual void SetGameState (const unsigned int &state);
+		/* Level loading etc. */
+		int DoLoadLevel (const char* filename);
+		int DoSaveLevel (const char* filename);
 
+		void ProceedToNextLevel ();
 		int GetPlayerLives () { return mPlayerLives; };
 		unsigned int GetPoints () { return mPoints; };
 		std::string GetPlayerName() { return mPlayerName; };
@@ -28,9 +34,7 @@ class Model : public Engine::ModelBase {
 			mPlayerName = name;
 		};
 
-		float GetWorldWidth ();
-		float GetWorldHeight ();
-
+		/* Highscore */
 		struct HighscoreEntry {
 			HighscoreEntry(): name ("unknown"), points (0) {	};
 			HighscoreEntry (const char *e_name, const unsigned int e_points):
@@ -40,7 +44,6 @@ class Model : public Engine::ModelBase {
 			unsigned int points;
 		};
 
-		/* Highscore */
 		void LoadHighscoreList ();
 		void SaveHighscoreList ();
 		unsigned int AddHighscoreEntry(const std::string &name, const unsigned int points);