Fix stack balancing problems by refactoring execution calls

- Con::executef now uses a template
- All public execution functions now restore the console stack upon return
- Fixed bad parameters on some callbacks
- Reverts get*Arg behavior

Engine/source/console/simObjectList.cpp

@@ -23,7 +23,8 @@
 #include "platform/platform.h"
 #include "console/simObjectList.h"
 
-#include "console/console.h"
+#include "console/simBase.h"
+#include "console/engineAPI.h"
 #include "console/sim.h"
 #include "console/simObject.h"