BGE Python API cleanup - no functionality changes

- comments to PyObjectPlus.h
- remove unused/commented junk.
- renamed PyDestructor to py_base_dealloc for consistency
- all the PyTypeObject's were still using the sizeof() their class, can use sizeof(PyObjectPlus_Proxy) now which is smaller too.

source/gameengine/GameLogic/SCA_RandomSensor.cpp

@@ -130,9 +130,9 @@ PyTypeObject SCA_RandomSensor::Type = {
 	PyObject_HEAD_INIT(NULL)
 	0,
 	"SCA_RandomSensor",
-	sizeof(SCA_RandomSensor),
+	sizeof(PyObjectPlus_Proxy),
 	0,
-	PyDestructor,
+	py_base_dealloc,
 	0,
 	0,
 	0,