Handle inactive account

One of my Basecamp trial account expired this morning causing `404 Not Found` errors. It makes Bitx background tasks stop. I just set a flag `basecampAccount.inactive` to true if I get the following response header:

```
HTTP/1.1 404 Not Found
Content-Type: application/json
Status: 404 Not Found
Reason: Account Inactive
```

It is not a big issue but if this fix can avoid us bad ratings, "doesn't work" reviews... :muscle: