py api cleanup, replace use...

- PyLong_FromSsize_t --> PyLong_FromLong
- PyLong_AsSsize_t --> PyLong_AsLong

In all places except for those where python api expects PySsize_t (index lookups mainly).

- use PyBool_FromLong in a few areas of the BGE.
- fix incorrect assumption in the BGE that PySequence_Check() means PySequence_Fast_ functions can be used.

source/gameengine/VideoTexture/VideoFFmpeg.cpp

@@ -1142,7 +1142,7 @@ static int VideoFFmpeg_setPreseek(PyImage *self, PyObject *value, void *closure)
 		return -1;
 	}
 	// set preseek
-	getFFmpeg(self)->setPreseek(PyLong_AsSsize_t(value));
+	getFFmpeg(self)->setPreseek(PyLong_AsLong(value));
 	// success
 	return 0;
 }