fix for warnings from Sparse static source code checker, mostly BKE/BLI and python functions.

- use NULL rather then 0 where possible (makes code & function calls more readable IMHO).
- set static variables and functions (exposed some unused vars/funcs).
- use func(void) rather then func() for definitions.

source/blender/python/generic/bpy_internal_import.c

@@ -212,7 +212,7 @@ static PyObject *blender_import(PyObject *UNUSED(self), PyObject *args,  PyObjec
 	
 	PyObject *newmodule;
 	//PyObject_Print(args, stderr, 0);
-	static const char *kwlist[] = {"name", "globals", "locals", "fromlist", "level", 0};
+	static const char *kwlist[] = {"name", "globals", "locals", "fromlist", "level", NULL};
 	
 	if( !PyArg_ParseTupleAndKeywords(args, kw, "s|OOOi:bpy_import_meth", (char **)kwlist,
 				   &name, &globals, &locals, &fromlist, &level) )