-Changed Godot exit to be clean.

-Added more debug information on memory cleanliness on exit (if run with -v)
-Fixed several memory leaks, fixes #1731, fixes #755

servers/visual/rasterizer.h

@@ -661,6 +661,7 @@ public:
 			};
 
 			Type type;
+			virtual ~Command(){}
 		};
 
 		struct CommandLine : public Command {