Improvements to console refactor code

- Prevent stack corruption in a few places
- Use correct type in printfs
- Reduce type conversions in EngineApi & dAto*
- Fix compilation on GCC
- Tidy up code

Engine/source/T3D/missionMarker.cpp

@@ -554,7 +554,7 @@ ConsoleMethod(SpawnSphere, spawnObject, S32, 2, 3,
    String additionalProps;
 
    if (argc == 3)
-      additionalProps = String(argv[2]);
+      additionalProps = (const char*)argv[2];
 
    SimObject* obj = object->spawnObject(additionalProps);