Warning cleanup

While I was looking in outliner.c, made some changes to let extra passes display
there such as environment (commented out before due to a previous limitation).

Also changed outliner object visbility/selectability/renderability toggles to use 
RNA buttons so you can insert keyframes with RMB menu etc.

source/blender/python/generic/blf_api.c

@@ -346,7 +346,6 @@ static char py_blf_load_doc[] =
 
 static PyObject *py_blf_load(PyObject *self, PyObject *args)
 {
-	int fontid = 0;
 	char* filename;
 
 	if (!PyArg_ParseTuple(args, "s:blf.load", &filename))