mod_http_oauth2: Record OAuth software id and version attached to tokens Unsure if these are used anywhere, but `software_id` is supposedly more unique than `client_uri` which can vary by registration or something? Software versions can also be good to know e.g. in case there is a security issue affecting certain versions that could warrant revocation of tokens issued to it.

Over the years, some servers stop working for various reasons, and leave
behind broken roster subscriptions that trigger failing s2s connections.
This module allows cleaning up such cases by unsubscribing local users
from their contacts on those servers. Also works for typos and the like.
Use with care.

```lua
Component "gmail.com" "unsubscriber"
```