[CS-5238] - Implement a configurable autodelete mechanism for pending us...

...ers (UserGarbageCollection Command)

- [x]   - [WOBS-3149] - character count for body text is missing (improvements)
- [x]   - [WOBS-3132] - Attached files don’t show up on backside of articles
- [x]   - [CS-5238] - Implement a configurable autodelete mechanism for pending users (UserGarbageCollection Command)
This is available also in backend: `Configure -> System Preferences -> Other settings`
```
Usage:
 user:garbage [--force]

Options:
 --force               If set, foreces command execution ommiting system preferences settings.
 --verbose (-v|vv|vvv) Increase the verbosity of messages: 1 for normal output, 2 for more verbose

Help:
 Removes obsolete pending users data
```

- [x] - Update cron job to execute user garbage console command (https://github.com/sourcefabric/Newscoop/pull/607 needs to be merged first) - this command will be executed everyday at 12:30 AM