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/platform/platformRedBook.cpp

@@ -22,6 +22,7 @@
 
 #include "core/strings/stringFunctions.h"
 #include "console/console.h"
+#include "console/simBase.h"
 #include "console/engineAPI.h"
 #include "platform/platformRedBook.h"